FAQ

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Typically, single-pipe ventilation systems or fans are used in bathrooms or combined bathroom/WC rooms. Which types are actually used depends on several factors that should be clarified in advance:

• What is the ventilation supposed to do? Vacuum bad odors? Dry the room?
• How large is the room and thus the volume of air to be exchanged?
• How busy is the room, i.e. does the ventilation have to be very fast?
• Can the exhaust air be transported directly outdoors by a short route or is it disposed of via a central exhaust air pipe? Are windows present?
• Is the fan intended as a single room solution or is it part of a centralized residential ventilation system.
• Is sufficient supply air ensured?

As a rule of thumb, axial fans are significantly less powerful than single-pipe ventilation systems and are only suitable for short, straight air transport paths. Their flexibility in control and installation options is limited. They are unsuitable for central ventilation pipes, for example in apartment blocks. If large quantities of air have to be moved over long distances in a short time, single-pipe ventilation systems have a clear advantage in practically all aspects: performance, multiple control options (time, humidity, movement, etc.), energy efficiency, multiple configurations, click & play installation. The LIMODOR systems offer optimally matched solutions depending on the specific ventilation task.

It is important to prevent danger from carbon monoxide, explosive, toxic or flammable substances. It is also essential to ensure sufficient fresh air supply. Therefore, a combination of an exhaust fan and a supply air system is recommended.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient ventilation in the event of momentarily high humidity and activate automatically in normal operation via a sensor above a certain humidity threshold. This saves energy and protects against moisture and mold growth.

Several quality factors count: A currently accumulating large amount of moisture must be transported out of the room into the open air as quickly as possible and at the same time without a large loss of energy. In addition, the room should not cool down much in the cold season to prevent condensation. This requires high-performance exhaust air units that run in an automated manner for short periods of time in full-load operation and then either turn off or run in an energy-efficient base-load mode. Ventilation activation is done by manual on/off or better automatically via pure efficient humidity control.

No, usually the fan is activated when the light is turned on and continues to run for a while. Or it is started by a motion module. Shutdown occurs automatically after the exchange of stale air. Alternatively, there are also humidity controls that switch ventilation on and off depending on the moisture content detected.

A comparison: For 7 minutes, a LIMODOR WC fan needs only 0.7 watts. A 100 watt light bulb for toilet lighting requires 11.7 watts for the same time, which is quickly 17 times as much electricity.

No, because only air is extracted from the room, but no cold outside air is drawn in. The room remains at the right temperature because warm air flows in from the living area.

This depends on the device performance. A simple, low-power axial fan will certainly take longer than a single-pipe fan. A typical LIMODOR toilet aerator takes only 5 to 7 minutes to remove all odors in a common toilet.

Especially with decentralized ventilation systemsoften used in bedrooms, such as the AirVital Prime, a double consumption optimization is given. Firstly, the energy loss compared to opening windows is almost completely eliminated due to an integrated heat exchanger. On the other hand, the built-in fans require minimal energy because they only run when needed and are consumption-optimized. In general, apartment or individual room ventilation saves an enormous amount of electricity in contrast to uncontrolled window opening, as cooling and thus necessary reheating of the room air is prevented during the cold season. Operating time is optimized with intelligent sensors and controls. The energy consumption of the highly efficient fan motors is hardly significant in comparison and is usually even significantly lower than that of the room lighting.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient venting in the event of momentarily high humidity and activate automatically in normal operation above a certain humidity threshold. This saves a lot of energy. If the room is located in the basement, it can also be integrated into a centrally controlled basement ventilation system, which also ensures optimal and efficient moisture removal.

Compared to uncoordinated, often incorrectly performed window ventilation, any exhaust system, no matter how simple, offers great energy-saving potential. Because fans primarily only run when they are needed. But then they provide a quick and convenient remedy – for example, for odors in the toilet or dampness in the bathroom. Control is via the light switch, timers or automated via motion and humidity sensors. Forgotten windows left open for hours are thus excluded.

Our star in terms of energy efficiency is the Limodor F/M-EC. Its highly efficient but powerful motor, smart controls, and even audible and visual indicators when dirty filters degrade efficiency make it our number one “air conditioning fan.” 40 to 50% power savings compared to conventional systems are easily achievable.

Depending on the type, Limodor exhaust systems offer very high flexibility and ease of maintenance. Many older fan types have been operating for half a century still using the first blower insert. If the blower does become defective, it can be quickly removed and replaced with a new one. The modern click-in system makes fan replacement particularly easy and practically tool-free. Depending on the connection and the selected fan activation – for example via overrun relay, humidity relay, motion relay, door contact or light switch – there is also great variability and exchangeability of the controls for almost all fans.

In the case of the modern top unit, the Limordor F/M-EC energy-saving fan, a smart plug-in board system has been developed that allows conversion to a different activation or a combination in just a few simple steps by replacing these control modules. For example, a two-stage blower insert of a bathroom ventilation system can be equipped with an adjustable overrun relay and a humidity module. This provides optimal ventilation performance and rapid moisture removal combined with automated comfort and minimal energy consumption.

Depending on whether axial fan, centrifugal fan or single-pipe fan, the mounting options are variable. Axial flow fans such as the Limax are typically installed in straight short ducts, such as a bathroom or toilet vent, that pass directly through the exterior wall. Centrifugal fans are also installed directly in the pipe run and are also suitable for longer pipes. However, depending on the structural situation, fire protection elements must be installed separately.

The most flexible is the Limodor single-pipe ventilation system. The fans can be installed as flush-mounted and surface-mounted variants, in and on walls or on the ceiling. They cover all areas of application in the house and also work as central exhaust in the attic, as individual fans, groups or in combination with other ventilation elements.

For efficient air exchange, some factors should be considered:

• The position of the fan, e.g. in the bathroom or toilet, should be chosen as close as possible to the point of origin of the humid or odorous air. This increases efficiency and speed.
• Do not mount fans in blind spots or areas where the intake airflow will encounter obstructions.
• Air flowing in, e.g. through doors or supply air elements, should also be able to sweep in the direction of the extraction unit as undisturbed as possible in order to be able to absorb a maximum of moisture, especially in the bathroom.
• In times of increasingly tight rooms and doors, it is essential to ensure sufficient supply air for fireplaces, if necessary by means of separate supply air elements, in order not to produce toxic carbon monoxide.
• Exhausted air should be able to get outside in the shortest and straightest way possible. Any kink or constriction lowers the efficiency.
• Of course, the fan arrangement must not cause any unpleasant drafts.

The most important bonus of the Limodor venting system is the possibility of connecting many units to a single exhaust duct, which is routed through a roof outlet, for example. Elaborate piping and unsightly fan grilles on the facade are eliminated. Fire dampers are already integrated in the housing. Typically, this variant is used in multi-apartment buildings for toilet and bathroom ventilation.

The devices are very simple and can also be mounted according to the construction progress. In the shell is first walled only the separate housing with a protective cover, the connections for power and air are connected. With a few simple steps and minimal tools, the blower insert is later connected to the power supply and simply clicked into place.

As exhaust fans, Limodor single-pipe fans are true powerhouses that can be mounted in any position and will not be disturbed by longer piping or kinks. They are multifunctional and can be used as toilet vents, bathroom or kitchen ventilators as efficiently as components of central ventilation systems or basement ventilation systems.

A bathroom fan is positioned as close as possible to where the greatest moisture occurs. So, for example, in the area of the shower or the bathtub. The extraction directly at the point of origin prevents the spread of the moist steam and thus quickly ensures a dry bath again. Mounting in “blind spots” should be avoided. It is important that the air in the bathroom from the supply air side, i.e. the bathroom door, can flow as undisturbed as possible in the direction of the fan, absorbing as much of the vapor produced as possible before it condenses. On the one hand, this achieves optimum dehumidification, and on the other hand, the extracted air volume is quickly replaced by an influx of tempered air from the living area. This prevents unpleasant cooling of the bathroom as it is the case when opening the window and thus saves a lot of energy.

A passive supply air system such as AirOnova is the ideal solution here. They can be used as individual elements to supply air to living rooms and bedrooms or integrated as a component in various LIMODOR exhaust systems. Sound insulation, filters to protect against dust, pollen and allergens, as well as wind pressure protection provide high comfort.

It is important to prevent danger from carbon monoxide, explosive, toxic or flammable substances. It is also essential to ensure sufficient fresh air supply. Therefore, a combination of an exhaust fan and a supply air system is recommended.

A passive supply air system such as AirOnova is the ideal solution here. Built into a simple wall breakthrough, it provides over filters to protect against dust, allergens and pesky insects. In addition, noise from outside is minimized by a silencer.

This depends on the ventilation system and the tightness of the room and doors. Supply air elements are recommended for well-insulated new buildings. In any case, sufficient supply air must be ensured if there is a fireplace or stove with an open fire in the room. This prevents toxic carbon monoxide, which is produced by a lack of oxygen. Passive supply air elements are generally recommended for modern rooms, which are becoming increasingly tight and better insulated for energy-saving reasons. For example, they also provide constant fresh air without noise, pollutants or insects when opening windows.

To ensure trouble-free operation of the supply air unit, the inlet grilles, filters, air ducts and the optionally installed wind or insect screen must be checked for dirt from time to time, cleaned if necessary and replaced if required.

It is recommended to perform a check at least twice a year. If there is a high dust or pollen load or in regions with a high incidence of insects, the inspection intervals must be shortened accordingly.

To ensure a proper and undisturbed air flow, the filter tray must not be covered by furniture, blinds, curtains and similar furnishing elements.
Since a supply air element does not have a heater and fresh air is therefore drawn in at the prevailing outside temperature, it is advisable to position the filter trough close to, ideally above, a radiator. This preheats the airflow during the cold season.

In general, a supply air element can either be installed like a ventilator in a straight wall opening or integrated inconspicuously in the window reveal as a special design with a 90° bend.

AirOnova supply air systems run either as a straight pipe through the house wall or, when installed in the window reveal, as a pipe with a supplementary 90° deflection and a so-called wide duct that is walled into the window reveal.

Starting from the outside, fresh air enters through a ventilation grille. On its way through the tube, it passes an insect screen and an optional wind pressure safety device. Noise protection is made possible by a silencer in the pipe. The fresh air exits through a so-called filter trough on the inner wall. The filter tray contains a filter insert that binds allergens and dust. The outgoing air volume can be infinitely adjusted manually. Drafts are prevented by this system.

For efficient air exchange, some factors should be considered:

• The position of the fan, e.g. in the bathroom or toilet, should be chosen as close as possible to the point of origin of the humid or odorous air. This increases efficiency and speed.
• Do not mount fans in blind spots or areas where the intake airflow will encounter obstructions.
• Air flowing in, e.g. through doors or supply air elements, should also be able to sweep in the direction of the extraction unit as undisturbed as possible in order to be able to absorb a maximum of moisture, especially in the bathroom.
• In times of increasingly tight rooms and doors, it is essential to ensure sufficient supply air for fireplaces, if necessary by means of separate supply air elements, in order not to produce toxic carbon monoxide.
• Exhausted air should be able to get outside in the shortest and straightest way possible. Any kink or constriction lowers the efficiency.
• Of course, the fan arrangement must not cause any unpleasant drafts.

Supply air systems of the AirOnova type, which Limodor offers in its product range, are purely passive elements. In modern form, they replace previously often existing door crack, leaky windows or other air entrances into the house. And, of course, then there is no need to open windows for ventilation. Supply air elements provide protection from annoying insects, dust and allergens through a filter insert. Particularly important is the noise protection provided by integrated silencers. In addition, the air supply can be adjusted continuously. Sudden gusts of wind are absorbed by an optional wind pressure safety device.

If one defines the term supply air system somewhat more broadly, then of course a motorized single-pipe fan, such as the type Limodor W, which is also referred to as a fan box, or a decentralized residential ventilation system such as the compact AirOdor can also be used to supply fresh air. For example, in apartment blocks with basement ventilation, a fan box is often integrated to draw in and distribute fresh air.

This is where the AirOdor comes in, extracting stale warm air and tempering the incoming fresh air via a heat exchanger. Since the air exchange is carried out via a pipe-in-pipe system with a diameter of only 160mm, the system can be installed quickly and easily. It is suitable, for example, for living room, bedroom or home office rooms.

The AirVital decentralized ventilation system for surface mounting. The room is soundproofed and supplied with fresh air in an energy-efficient manner via a two-way supply/exhaust air pipe. The compact device is ideal for retrofitting. Only one core hole to the outside and a power connection are required.

If there is the possibility of a straight direct connection to the outside – e.g. in the living area or in the case of semi-exposed basements on slopes – then, depending on the specific situation and where it makes sense in terms of energy technology, fans can be replaced by compact decentralized living space ventilation systems at relatively little expense. These have built-in heat exchangers.

Especially with decentralized ventilation systemsoften used in bedrooms, such as the AirVital Prime, a double consumption optimization is given. Firstly, the energy loss compared to opening windows is almost completely eliminated due to an integrated heat exchanger. On the other hand, the built-in fans require minimal energy because they only run when needed and are consumption-optimized. In general, apartment or individual room ventilation saves an enormous amount of electricity in contrast to uncontrolled window opening, as cooling and thus necessary reheating of the room air is prevented during the cold season. Operating time is optimized with intelligent sensors and controls. The energy consumption of the highly efficient fan motors is hardly significant in comparison and is usually even significantly lower than that of the room lighting.

A function of the control system ensures that air exchange takes place only during cool night hours. An “intensive ventilation” function can also very quickly replace warm, sultry air in the room with cool night air before bedtime. Typical bedroom ventilation systems constructively optimally soundproofed, guarantee whisper-quiet operation and save the decision “fresh air or noise from outside” especially in sultry summer nights.

Optimized sound insulation ensures whisper-quiet operation. Either in the covers and/or as a silencer in the wall opening. This keeps both the noise from outside and the already barely audible noise of the fans safely in check.

The three Decentralized Residential Ventilation Systems available from Limodor are equipped with exhaust air filters and supply air filters. The exhaust air filters prevent dirt (house dust, hair, aerosols, etc.) sucked in from the interior from attaching to the heat exchanger, fan or other components and impairing their efficiency or hygiene. The same applies to the supply air filters.

In addition to standard particle filters, activated carbon filters or fine dust filters can also be used, which separate even much smaller particles. They prevent allergens such as pollen, soot particles and various pathogens from entering the interior with the fresh air. Regular filter checks for contamination or the insertion of new filters is important for full effectiveness. The necessary change is indicated by the devices.

If these simple rules are taken to heart, then compared to uncoordinated window ventilation or cheap fans, decentralized residential ventilation provides very effective allergy protection for the home.

The three Limodor decentralized ventilation systems differ in their design:

The simple AirOdor basically has an axilal fan and a ceramic heat accumulator. During venting, the exhaust air flows over its surface and transfers its heat to it. Depending on the set cycle time, the fan then changes its direction of rotation and draws in fresh air, which passes over the previously heated surface and is thus tempered. Filters on both the supply air and exhaust air sides prevent fouling of the heat exchanger.

The AirVital and AirVital PRIME systems, on the other hand, have a counterflow heat exchanger and two fans. During operation, the supply and exhaust air flows are switched on simultaneously. The specially designed heat exchanger enables the warm air extracted from the inside to continuously transfer its thermal energy to the fresh air intake from the outside. There is no mixing of the two streams. Up to 94.5% energy recovery efficiency combined with minimal electricity costs for the fans in the AirVital PRIME impressively illustrate the energy efficiency of this system.

The central energy-saving element of these comfort ventilation units is the heat exchanger. It provides heat recovery in various construction methods, preserving the vast majority of energy in the house. The exhaust air stream sweeps over the heat-storing surface, releasing its contained energy. The incoming cool fresh air passes over the heat exchanger in the opposite direction and is pleasantly tempered.

This means that when air is exchanged, energy is saved twice: existing heating energy from inside the house is not released uselessly into the environment, as it is when windows are opened. Cold fresh air comes into the house already preheated and does not have to be heated by the heating system, which significantly reduces heating costs in the many cycles throughout the year.

Sometimes central ventilation is optimal. For example, if it can be planned from scratch for the entire living area in a new building with maximum efficiency. Or as basement ventilation, where a smart control system ensures condensation, mold growth and typical musty basement odors for the entire basement floor under sensor control.

A decentralized living space ventilation system with heat recovery is often ideal for renovations. It is ideal for retrofitting small apartments, offices or bedrooms, for example, where installation costs are manageable. In addition, these systems are very quiet and extremely energy efficient.

Sometimes, however, single units in only some rooms such as toilets, bathrooms, wellness rooms, utility rooms or garages are the best solution. Control modules allow the fans to be optimally adapted to the task at hand and automated. Combined with properly executed window ventilation in the rest of the apartment, this creates an inexpensive, yet energy-saving and comfortable solution.

The advantages and disadvantages, and then the appropriate system selection, are best made together with the architect or builder and the installer who will plan and implement the ventilation design.

The most important bonus of decentralized residential ventilation is its ease of installation. Decentralized ventilation units can be installed specifically in individual rooms. It is not necessary to relocate the pipe system. Essentially, all that is required is a wall breakthrough or core drilling through the exterior wall of the room in question and an electrical connection. Several devices can be used independently of each other in different living areas. A combination of centralized and decentralized residential ventilation is also possible.

Effective dehumidification works only when the humidity outside is lower than inside. This is also temperature dependent. The controller uses the sensors to detect when optimal ventilation conditions are present. Only then it activates the ventilation. Faulty ventilation with warm humid air from outside is prevented.

Often in basement rooms are located laundry room, laundry drying room, sauna or fitness room. Surges of moisture, for example after a sauna session or after hanging up a load of wet laundry, are detected by the moisture sensor and the ventilation is activated at intensive level for a limited time to remove the moist air from the room as quickly as possible.

Yes, the control system detects a momentary high moisture load and automatically activates the ventilation, which quickly and efficiently brings the steam outside. At the same time, however, it ensures that in normal everyday life, ventilation only takes place when the outside air is drier than the basement air. this provides optimal cellar climate.

Yes, individual systems can be realized for both single-family houses and apartment buildings. They are planned individually according to the size and situation on site. In larger properties, where basements are shared by many residents, it is often useful to have more sensors, additional or more powerful ventilation elements, and other controls. Compact single-family basements are individually designed in terms of ventilation to suit the particular use by the homeowners. Where desired and appropriate, they can be integrated with the rest of the rooms in the house in a common ventilation concept or equipped as needed, for example, with a sauna ventilation.

LIMODOR basement ventilation systems are available in a standardized basic configuration as well as in a configuration that can be planned as desired.

Yes. Some systems even have a “party mode”, which reacts to the temporarily increased load caused by many people in the room and adjusts the ventilation output accordingly. At the end of the party, the system falls back to the particularly energy-efficient everyday operation.

This is system and control dependent. Often, central ventilation systems have a very economical base load operation when the occupants are absent, which only takes corrective action for a few minutes to ensure the set room climate parameters. However, these change little in empty rooms. Individual fans or decentralized systems can also be switched off completely as required.

Of course! For example, most controlled ventilation systems have a summer mode that takes into account the active use of a terrace or balcony and adjusts the ventilation function accordingly. In cold or bad weather, on the other hand, the best indoor climate is always ensured without energy-consuming window opening.

In this case, a powerful fan box is the ideal solution, which simultaneously extracts air at several points and brings it outside via poppet valves installed in a central exhaust pipe running across the basement. Dry fresh air enters the basement from outside via a second fan box, a central supply air pipe and poppet valves in the reverse direction. A control system ensures that the ventilation is only activated when ventilation conditions are optimal.

To prevent fire and smoke from spreading through the exhaust ducts of a central ventilation system in the event of a fire, the building code prescribes standardized protective devices tested by independent testing bodies for their function and effect, and installation principles to be observed. These include, above all, cold smoke barriers and fire protection bulkheads or dampers. They are installed in the pipe network, are maintenance-free and automatically and safely close the pipe in case of fire. A suction effect caused by the prevailing temperature-related pressure differences is thus prevented.

Fire protection bulkheads or dampers separate the room affected by a fire by heat-resistantly locking the exhaust pipe leading out of it above a certain temperature, thus preventing the fire from spreading to the rest of the pipe system. Cold smoke barriers prevent the penetration of smoke and vapors in ventilation units in the other rooms. They are closed by a spring as standard and are opened only when the fans are in operation by the airflow leaving the room. This always ensures protection from smoke from the pipe system in areas not affected by the fire.

Single-pipe ventilation systems and fans must be installed professionally and in accordance with building codes to provide this life-saving safety. Fire protection bulkheads and cold smoke barriers are included in Limodor’s product range as accessories and meet the highest safety standards. In the Limodor single-pipe ventilation system, the fire protection devices are already integrated in the fan housing.

The control of a central ventilation system has different functions depending on the specific design. In the AirClean system, the central fresh air supply and several decentralized exhaust air units, such as the Limodor F/M single-pipe fans, are controlled in an optimally coordinated manner for base load operation by a control element mounted in the electrical control box. Demand ventilation, party mode or summer mode are also set via the central control. Exhaust air elements are additionally individually controllable in each room. They can, for example, be switched from base load to full load for a short time in the bathroom by means of a humidity sensor or in the toilet by means of a motion sensor and thus quickly perform their respective ventilation task.

A special case is the AirBase basement ventilation: Here, the controller receives measurement signals from humidity and temperature sensors located in the basement and outside. Depending on these signals, cellar drying is activated when conditions are optimal. But even here, for example with the Limodor F/M-EC single-pipe ventilation system with humidity module, the humid air surge of a sauna can be quickly extracted at full capacity. Mold growth and basement moisture are optimally prevented by this combination of energy-saving base load operation and short-term demand ventilation at full load.

In times of scarce and expensive living space, the basement is increasingly coming into focus as an additional reserve of space. For example, for the home office, but also for a sauna or a fitness room. A well-known problem even in modern houses: Especially in summer, mold or musty smells often form on the cool basement walls due to condensation of moist warm outside air. Simple ventilation is of no use here, it often even aggravates the situation.

The AirBase basement ventilation system therefore works sensor-controlled. Humidity and temperature inside and outside are measured. A smart control unit ensures that only dry outside air enters the house. Humid or odorous indoor air is extracted. This provides optimal cellar drying. Sauna ventilation can also be integrated. Mold protection is thus guaranteed, as is full flexibility in design and operation analogous to residential ventilation.

Sometimes central ventilation is optimal. For example, if it can be planned from scratch for the entire living area in a new building with maximum efficiency. Or as basement ventilation, where a smart control system ensures condensation, mold growth and typical musty basement odors for the entire basement floor under sensor control.

A decentralized living space ventilation system with heat recovery is often ideal for renovations. It is ideal for retrofitting small apartments, offices or bedrooms, for example, where installation costs are manageable. In addition, these systems are very quiet and extremely energy efficient.

Sometimes, however, single units in only some rooms such as toilets, bathrooms, wellness rooms, utility rooms or garages are the best solution. Control modules allow the fans to be optimally adapted to the task at hand and automated. Combined with properly executed window ventilation in the rest of the apartment, this creates an inexpensive, yet energy-saving and comfortable solution.

The advantages and disadvantages, and then the appropriate system selection, are best made together with the architect or builder and the installer who will plan and implement the ventilation design.

The advantage of centrally controlled living space ventilation is an optimal feel-good climate throughout the entire living area. The connected supply air and exhaust air units run at a permanent, very energy-saving base load level. However, each of these ventilation units can be individually switched to other operating levels by means of overrun relays, humidity control, motion detectors or similar. In the case of WC ventilators or bathroom ventilation systems, for example, the respective ventilation elements are adapted to the optimum operating mode in terms of space and time. The great advantage of this is that the supply and exhaust air are not simply routed through the house wall, but first through the heat exchanger. This means that the thermal energy of the exhaust air, which would otherwise be lost, tempers the incoming fresh air. Each time a small, but in total a large contribution to climate protection and heating cost reduction.

The AirClean system also offers winter and summer modes, as well as “party mode”. With many visitors at the same time, this ensures that the temperature, humidity and fresh air supply remain comfortable for everyone by increasing the ventilation capacity. Maximum flexibility is therefore always ensured with controlled residential ventilation from Limodor.

Typically, single-pipe ventilation systems or fans are used in bathrooms or combined bathroom/WC rooms. Which types are actually used depends on several factors that should be clarified in advance:

• What is the ventilation supposed to do? Vacuum bad odors? Dry the room?
• How large is the room and thus the volume of air to be exchanged?
• How busy is the room, i.e. does the ventilation have to be very fast?
• Can the exhaust air be transported directly outdoors by a short route or is it disposed of via a central exhaust air pipe? Are windows present?
• Is the fan intended as a single room solution or is it part of a centralized residential ventilation system.
• Is sufficient supply air ensured?

As a rule of thumb, axial fans are significantly less powerful than single-pipe ventilation systems and are only suitable for short, straight air transport paths. Their flexibility in control and installation options is limited. They are unsuitable for central ventilation pipes, for example in apartment blocks. If large quantities of air have to be moved over long distances in a short time, single-pipe ventilation systems have a clear advantage in practically all aspects: performance, multiple control options (time, humidity, movement, etc.), energy efficiency, multiple configurations, click & play installation. The LIMODOR systems offer optimally matched solutions depending on the specific ventilation task.

This is where the AirOdor comes in, extracting stale warm air and tempering the incoming fresh air via a heat exchanger. Since the air exchange is carried out via a pipe-in-pipe system with a diameter of only 160mm, the system can be installed quickly and easily. It is suitable, for example, for living room, bedroom or home office rooms.

The AirVital decentralized ventilation system for surface mounting. The room is soundproofed and supplied with fresh air in an energy-efficient manner via a two-way supply/exhaust air pipe. The compact device is ideal for retrofitting. Only one core hole to the outside and a power connection are required.

A passive supply air system such as AirOnova is the ideal solution here. They can be used as individual elements to supply air to living rooms and bedrooms or integrated as a component in various LIMODOR exhaust systems. Sound insulation, filters to protect against dust, pollen and allergens, as well as wind pressure protection provide high comfort.

It is important to prevent danger from carbon monoxide, explosive, toxic or flammable substances. It is also essential to ensure sufficient fresh air supply. Therefore, a combination of an exhaust fan and a supply air system is recommended.

A passive supply air system such as AirOnova is the ideal solution here. Built into a simple wall breakthrough, it provides over filters to protect against dust, allergens and pesky insects. In addition, noise from outside is minimized by a silencer.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient ventilation in the event of momentarily high humidity and activate automatically in normal operation via a sensor above a certain humidity threshold. This saves energy and protects against moisture and mold growth.

If there is the possibility of a straight direct connection to the outside – e.g. in the living area or in the case of semi-exposed basements on slopes – then, depending on the specific situation and where it makes sense in terms of energy technology, fans can be replaced by compact decentralized living space ventilation systems at relatively little expense. These have built-in heat exchangers.

Effective dehumidification works only when the humidity outside is lower than inside. This is also temperature dependent. The controller uses the sensors to detect when optimal ventilation conditions are present. Only then it activates the ventilation. Faulty ventilation with warm humid air from outside is prevented.

Often in basement rooms are located laundry room, laundry drying room, sauna or fitness room. Surges of moisture, for example after a sauna session or after hanging up a load of wet laundry, are detected by the moisture sensor and the ventilation is activated at intensive level for a limited time to remove the moist air from the room as quickly as possible.

Several quality factors count: A currently accumulating large amount of moisture must be transported out of the room into the open air as quickly as possible and at the same time without a large loss of energy. In addition, the room should not cool down much in the cold season to prevent condensation. This requires high-performance exhaust air units that run in an automated manner for short periods of time in full-load operation and then either turn off or run in an energy-efficient base-load mode. Ventilation activation is done by manual on/off or better automatically via pure efficient humidity control.

Yes, the control system detects a momentary high moisture load and automatically activates the ventilation, which quickly and efficiently brings the steam outside. At the same time, however, it ensures that in normal everyday life, ventilation only takes place when the outside air is drier than the basement air. this provides optimal cellar climate.

Yes, individual systems can be realized for both single-family houses and apartment buildings. They are planned individually according to the size and situation on site. In larger properties, where basements are shared by many residents, it is often useful to have more sensors, additional or more powerful ventilation elements, and other controls. Compact single-family basements are individually designed in terms of ventilation to suit the particular use by the homeowners. Where desired and appropriate, they can be integrated with the rest of the rooms in the house in a common ventilation concept or equipped as needed, for example, with a sauna ventilation.

LIMODOR basement ventilation systems are available in a standardized basic configuration as well as in a configuration that can be planned as desired.

Effective dehumidification works only when the humidity outside is lower than inside. The controller uses combined temperature and humidity sensors to detect when optimal ventilation conditions exist. Only then it activates the ventilation. Faulty ventilation is prevented. Another important criterion is the wellness or fitness areas increasingly located in basements. Moisture is typically generated in these, often large amounts in a short period of time as in sauna airing. This must be reliably detected and extracted, ideally without making these rooms uncomfortably cool. At the same time, unpleasant smell of sweat is also removed with and the rest of the storage rooms are protected from mold and cellar stink. The smart control system takes care of that.

A comparison: For 7 minutes, a LIMODOR WC fan needs only 0.7 watts. A 100 watt light bulb for toilet lighting requires 11.7 watts for the same time, which is quickly 17 times as much electricity.

This depends on the device performance. A simple, low-power axial fan will certainly take longer than a single-pipe fan. A typical LIMODOR toilet aerator takes only 5 to 7 minutes to remove all odors in a common toilet.

Especially with decentralized ventilation systemsoften used in bedrooms, such as the AirVital Prime, a double consumption optimization is given. Firstly, the energy loss compared to opening windows is almost completely eliminated due to an integrated heat exchanger. On the other hand, the built-in fans require minimal energy because they only run when needed and are consumption-optimized. In general, apartment or individual room ventilation saves an enormous amount of electricity in contrast to uncontrolled window opening, as cooling and thus necessary reheating of the room air is prevented during the cold season. Operating time is optimized with intelligent sensors and controls. The energy consumption of the highly efficient fan motors is hardly significant in comparison and is usually even significantly lower than that of the room lighting.

On the contrary! On the one hand, they are not attracted by open windows, and on the other hand, filters are installed in the vents to prevent them from entering. If there is a guarantee of undisturbed sleep without annoying buzzing, it is through ventilation elements.

A function of the control system ensures that air exchange takes place only during cool night hours. An “intensive ventilation” function can also very quickly replace warm, sultry air in the room with cool night air before bedtime. Typical bedroom ventilation systems constructively optimally soundproofed, guarantee whisper-quiet operation and save the decision “fresh air or noise from outside” especially in sultry summer nights.

Optimized sound insulation ensures whisper-quiet operation. Either in the covers and/or as a silencer in the wall opening. This keeps both the noise from outside and the already barely audible noise of the fans safely in check.

This depends on the ventilation system and the tightness of the room and doors. Supply air elements are recommended for well-insulated new buildings. In any case, sufficient supply air must be ensured if there is a fireplace or stove with an open fire in the room. This prevents toxic carbon monoxide, which is produced by a lack of oxygen. Passive supply air elements are generally recommended for modern rooms, which are becoming increasingly tight and better insulated for energy-saving reasons. For example, they also provide constant fresh air without noise, pollutants or insects when opening windows.

This is system and control dependent. Often, central ventilation systems have a very economical base load operation when the occupants are absent, which only takes corrective action for a few minutes to ensure the set room climate parameters. However, these change little in empty rooms. Individual fans or decentralized systems can also be switched off completely as required.

Of course! For example, most controlled ventilation systems have a summer mode that takes into account the active use of a terrace or balcony and adjusts the ventilation function accordingly. In cold or bad weather, on the other hand, the best indoor climate is always ensured without energy-consuming window opening.

In this case, a powerful fan box is the ideal solution, which simultaneously extracts air at several points and brings it outside via poppet valves installed in a central exhaust pipe running across the basement. Dry fresh air enters the basement from outside via a second fan box, a central supply air pipe and poppet valves in the reverse direction. A control system ensures that the ventilation is only activated when ventilation conditions are optimal.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient venting in the event of momentarily high humidity and activate automatically in normal operation above a certain humidity threshold. This saves a lot of energy. If the room is located in the basement, it can also be integrated into a centrally controlled basement ventilation system, which also ensures optimal and efficient moisture removal.

To ensure trouble-free operation of the supply air unit, the inlet grilles, filters, air ducts and the optionally installed wind or insect screen must be checked for dirt from time to time, cleaned if necessary and replaced if required.

It is recommended to perform a check at least twice a year. If there is a high dust or pollen load or in regions with a high incidence of insects, the inspection intervals must be shortened accordingly.

To ensure a proper and undisturbed air flow, the filter tray must not be covered by furniture, blinds, curtains and similar furnishing elements.
Since a supply air element does not have a heater and fresh air is therefore drawn in at the prevailing outside temperature, it is advisable to position the filter trough close to, ideally above, a radiator. This preheats the airflow during the cold season.

In general, a supply air element can either be installed like a ventilator in a straight wall opening or integrated inconspicuously in the window reveal as a special design with a 90° bend.

AirOnova supply air systems run either as a straight pipe through the house wall or, when installed in the window reveal, as a pipe with a supplementary 90° deflection and a so-called wide duct that is walled into the window reveal.

Starting from the outside, fresh air enters through a ventilation grille. On its way through the tube, it passes an insect screen and an optional wind pressure safety device. Noise protection is made possible by a silencer in the pipe. The fresh air exits through a so-called filter trough on the inner wall. The filter tray contains a filter insert that binds allergens and dust. The outgoing air volume can be infinitely adjusted manually. Drafts are prevented by this system.

The three Limodor decentralized ventilation systems differ in their design:

The simple AirOdor basically has an axilal fan and a ceramic heat accumulator. During venting, the exhaust air flows over its surface and transfers its heat to it. Depending on the set cycle time, the fan then changes its direction of rotation and draws in fresh air, which passes over the previously heated surface and is thus tempered. Filters on both the supply air and exhaust air sides prevent fouling of the heat exchanger.

The AirVital and AirVital PRIME systems, on the other hand, have a counterflow heat exchanger and two fans. During operation, the supply and exhaust air flows are switched on simultaneously. The specially designed heat exchanger enables the warm air extracted from the inside to continuously transfer its thermal energy to the fresh air intake from the outside. There is no mixing of the two streams. Up to 94.5% energy recovery efficiency combined with minimal electricity costs for the fans in the AirVital PRIME impressively illustrate the energy efficiency of this system.

The central energy-saving element of these comfort ventilation units is the heat exchanger. It provides heat recovery in various construction methods, preserving the vast majority of energy in the house. The exhaust air stream sweeps over the heat-storing surface, releasing its contained energy. The incoming cool fresh air passes over the heat exchanger in the opposite direction and is pleasantly tempered.

This means that when air is exchanged, energy is saved twice: existing heating energy from inside the house is not released uselessly into the environment, as it is when windows are opened. Cold fresh air comes into the house already preheated and does not have to be heated by the heating system, which significantly reduces heating costs in the many cycles throughout the year.

To prevent fire and smoke from spreading through the exhaust ducts of a central ventilation system in the event of a fire, the building code prescribes standardized protective devices tested by independent testing bodies for their function and effect, and installation principles to be observed. These include, above all, cold smoke barriers and fire protection bulkheads or dampers. They are installed in the pipe network, are maintenance-free and automatically and safely close the pipe in case of fire. A suction effect caused by the prevailing temperature-related pressure differences is thus prevented.

Fire protection bulkheads or dampers separate the room affected by a fire by heat-resistantly locking the exhaust pipe leading out of it above a certain temperature, thus preventing the fire from spreading to the rest of the pipe system. Cold smoke barriers prevent the penetration of smoke and vapors in ventilation units in the other rooms. They are closed by a spring as standard and are opened only when the fans are in operation by the airflow leaving the room. This always ensures protection from smoke from the pipe system in areas not affected by the fire.

Single-pipe ventilation systems and fans must be installed professionally and in accordance with building codes to provide this life-saving safety. Fire protection bulkheads and cold smoke barriers are included in Limodor’s product range as accessories and meet the highest safety standards. In the Limodor single-pipe ventilation system, the fire protection devices are already integrated in the fan housing.

The control of a central ventilation system has different functions depending on the specific design. In the AirClean system, the central fresh air supply and several decentralized exhaust air units, such as the Limodor F/M single-pipe fans, are controlled in an optimally coordinated manner for base load operation by a control element mounted in the electrical control box. Demand ventilation, party mode or summer mode are also set via the central control. Exhaust air elements are additionally individually controllable in each room. They can, for example, be switched from base load to full load for a short time in the bathroom by means of a humidity sensor or in the toilet by means of a motion sensor and thus quickly perform their respective ventilation task.

A special case is the AirBase basement ventilation: Here, the controller receives measurement signals from humidity and temperature sensors located in the basement and outside. Depending on these signals, cellar drying is activated when conditions are optimal. But even here, for example with the Limodor F/M-EC single-pipe ventilation system with humidity module, the humid air surge of a sauna can be quickly extracted at full capacity. Mold growth and basement moisture are optimally prevented by this combination of energy-saving base load operation and short-term demand ventilation at full load.

In times of scarce and expensive living space, the basement is increasingly coming into focus as an additional reserve of space. For example, for the home office, but also for a sauna or a fitness room. A well-known problem even in modern houses: Especially in summer, mold or musty smells often form on the cool basement walls due to condensation of moist warm outside air. Simple ventilation is of no use here, it often even aggravates the situation.

The AirBase basement ventilation system therefore works sensor-controlled. Humidity and temperature inside and outside are measured. A smart control unit ensures that only dry outside air enters the house. Humid or odorous indoor air is extracted. This provides optimal cellar drying. Sauna ventilation can also be integrated. Mold protection is thus guaranteed, as is full flexibility in design and operation analogous to residential ventilation.

Compared to uncoordinated, often incorrectly performed window ventilation, any exhaust system, no matter how simple, offers great energy-saving potential. Because fans primarily only run when they are needed. But then they provide a quick and convenient remedy – for example, for odors in the toilet or dampness in the bathroom. Control is via the light switch, timers or automated via motion and humidity sensors. Forgotten windows left open for hours are thus excluded.

Our star in terms of energy efficiency is the Limodor F/M-EC. Its highly efficient but powerful motor, smart controls, and even audible and visual indicators when dirty filters degrade efficiency make it our number one “air conditioning fan.” 40 to 50% power savings compared to conventional systems are easily achievable.

Depending on whether axial fan, centrifugal fan or single-pipe fan, the mounting options are variable. Axial flow fans such as the Limax are typically installed in straight short ducts, such as a bathroom or toilet vent, that pass directly through the exterior wall. Centrifugal fans are also installed directly in the pipe run and are also suitable for longer pipes. However, depending on the structural situation, fire protection elements must be installed separately.

The most flexible is the Limodor single-pipe ventilation system. The fans can be installed as flush-mounted and surface-mounted variants, in and on walls or on the ceiling. They cover all areas of application in the house and also work as central exhaust in the attic, as individual fans, groups or in combination with other ventilation elements.

Ventilation systems are indispensable partners in modern new buildings as well as in renovation projects. Energy efficiency, noise protection, comfort, safety from allergens, fine dust, pathogens or insects – there is a lot to be said for modern ventilation. It is important to always proceed with common sense and to obtain detailed advice.

Sometimes central ventilation or a decentralized residential ventilation system with heat recovery is ideal. The latter is ideal for retrofitting offices or bedrooms, for example, where installation costs are manageable. Sometimes, however, single units in only some rooms such as toilets and bathrooms combined with properly performed window ventilation are an inexpensive, yet energy-saving and comfortable solution. All of these issues are best discussed with the architect or builder and the installer who will design and implement the ventilation layout.

For efficient air exchange, some factors should be considered:

• The position of the fan, e.g. in the bathroom or toilet, should be chosen as close as possible to the point of origin of the humid or odorous air. This increases efficiency and speed.
• Do not mount fans in blind spots or areas where the intake airflow will encounter obstructions.
• Air flowing in, e.g. through doors or supply air elements, should also be able to sweep in the direction of the extraction unit as undisturbed as possible in order to be able to absorb a maximum of moisture, especially in the bathroom.
• In times of increasingly tight rooms and doors, it is essential to ensure sufficient supply air for fireplaces, if necessary by means of separate supply air elements, in order not to produce toxic carbon monoxide.
• Exhausted air should be able to get outside in the shortest and straightest way possible. Any kink or constriction lowers the efficiency.
• Of course, the fan arrangement must not cause any unpleasant drafts.

Ventilation systems are indispensable partners in modern new buildings as well as in renovation projects, and in times of energy and climate change they are valuable sustainability tools for the environment and the wallet. In order to generate maximum benefit with an economically sensible investment in new construction or renovation, some basic considerations should be made and expert advice sought from ventilation engineers, installers or planners:

• New construction or renovation? In the case of new buildings, optimal ventilation planning and thus full freedom of choice is possible. In the case of refurbishment, the aim should be to minimize the necessary construction work – such as the need to break through walls, the installation work required for pipes and electrical connections, and so on. – for retrofitting. Maximum energy efficiency must of course be ensured. Decentralized ventilation solutions or Exhaust air systems in individual rooms.
• Window opening versus investment for ventilation units: Fans are particularly useful wherever multiple synergies can be utilized. For example, energy efficiency with simultaneous protection against odor, noise, insects or pollutants. Toilets and bathrooms are difficult to ventilate quickly and efficiently by simply opening windows to remove odor or moisture. In the process, they also cool down in the cold season, which wastes energy and makes the indoor climate uncomfortable. An exhaust air system pays for itself particularly quickly.
• Capital expenditure: Centrally controlled complete system for the whole house? Heat recovery? Include basement? Or only ventilation of exposed rooms such as toilet, bathroom or sauna room? With which and how many fans can optimal effect be achieved?
• Maintenance effort: In the case of decentralized, exhaust air and supply air systems, the installed filters must be replaced regularly and, for example, insect screens must also be checked. For some central air systems, additional considerations include sometimes long, hard-to-reach ductwork or regular inspection of the heat pump where present. This increases maintenance costs.
• Operating costs: LIMODOR systems are extremely energy-efficient. However, some systems still run at a very economical base load level all day to ensure a constant indoor climate. Other systems such as single-pipe ventilators can be controlled in a particularly efficient and automated manner via humidity, time or movement modules, so that the additional costs for these components quickly pay for themselves. Economy optimal for renovations are also decentralized solutions with integrated heat exchanger.

A bathroom fan is positioned as close as possible to where the greatest moisture occurs. So, for example, in the area of the shower or the bathtub. The extraction directly at the point of origin prevents the spread of the moist steam and thus quickly ensures a dry bath again. Mounting in “blind spots” should be avoided. It is important that the air in the bathroom from the supply air side, i.e. the bathroom door, can flow as undisturbed as possible in the direction of the fan, absorbing as much of the vapor produced as possible before it condenses. On the one hand, this achieves optimum dehumidification, and on the other hand, the extracted air volume is quickly replaced by an influx of tempered air from the living area. This prevents unpleasant cooling of the bathroom as it is the case when opening the window and thus saves a lot of energy.

This depends on several factors that should be considered before selection and planning: What is the general structural environment, what structural measures are possible at all? House or apartment? Does a family or a single person live here in a small apartment? New construction or renovation? Central ventilation solution for all rooms or individual solutions in single rooms? Which room specifically? Which ventilation tasks and needs (e.g. removal of humidity or odor, fresh air without noise, insects or pollutants, energy optimization…) are in particular focus? How much can be invested financially? How intensively is the apartment used? It is best to list and evaluate these and many other questions in advance. A good initial overview is given by our info section on ventilation systems and/or alternatively on ventilation solutions according to specific living spaces.

Typically, single-pipe ventilation systems or fans are used in bathrooms or combined bathroom/WC rooms. Which types are actually used depends on several factors that should be clarified in advance:

• What is the ventilation supposed to do? Vacuum bad odors? Dry the room?
• How large is the room and thus the volume of air to be exchanged?
• How busy is the room, i.e. does the ventilation have to be very fast?
• Can the exhaust air be transported directly outdoors by a short route or is it disposed of via a central exhaust air pipe? Are windows present?
• Is the fan intended as a single room solution or is it part of a centralized residential ventilation system.
• Is sufficient supply air ensured?

As a rule of thumb, axial fans are significantly less powerful than single-pipe ventilation systems and are only suitable for short, straight air transport paths. Their flexibility in control and installation options is limited. They are unsuitable for central ventilation pipes, for example in apartment blocks. If large quantities of air have to be moved over long distances in a short time, single-pipe ventilation systems have a clear advantage in practically all aspects: performance, multiple control options (time, humidity, movement, etc.), energy efficiency, multiple configurations, click & play installation. The LIMODOR systems offer optimally matched solutions depending on the specific ventilation task.

This is where the AirOdor comes in, extracting stale warm air and tempering the incoming fresh air via a heat exchanger. Since the air exchange is carried out via a pipe-in-pipe system with a diameter of only 160mm, the system can be installed quickly and easily. It is suitable, for example, for living room, bedroom or home office rooms.

The AirVital decentralized ventilation system for surface mounting. The room is soundproofed and supplied with fresh air in an energy-efficient manner via a two-way supply/exhaust air pipe. The compact device is ideal for retrofitting. Only one core hole to the outside and a power connection are required.

A passive supply air system such as AirOnova is the ideal solution here. They can be used as individual elements to supply air to living rooms and bedrooms or integrated as a component in various LIMODOR exhaust systems. Sound insulation, filters to protect against dust, pollen and allergens, as well as wind pressure protection provide high comfort.

It is important to prevent danger from carbon monoxide, explosive, toxic or flammable substances. It is also essential to ensure sufficient fresh air supply. Therefore, a combination of an exhaust fan and a supply air system is recommended.

A passive supply air system such as AirOnova is the ideal solution here. Built into a simple wall breakthrough, it provides over filters to protect against dust, allergens and pesky insects. In addition, noise from outside is minimized by a silencer.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient ventilation in the event of momentarily high humidity and activate automatically in normal operation via a sensor above a certain humidity threshold. This saves energy and protects against moisture and mold growth.

If there is the possibility of a straight direct connection to the outside – e.g. in the living area or in the case of semi-exposed basements on slopes – then, depending on the specific situation and where it makes sense in terms of energy technology, fans can be replaced by compact decentralized living space ventilation systems at relatively little expense. These have built-in heat exchangers.

Effective dehumidification works only when the humidity outside is lower than inside. This is also temperature dependent. The controller uses the sensors to detect when optimal ventilation conditions are present. Only then it activates the ventilation. Faulty ventilation with warm humid air from outside is prevented.

Often in basement rooms are located laundry room, laundry drying room, sauna or fitness room. Surges of moisture, for example after a sauna session or after hanging up a load of wet laundry, are detected by the moisture sensor and the ventilation is activated at intensive level for a limited time to remove the moist air from the room as quickly as possible.

Several quality factors count: A currently accumulating large amount of moisture must be transported out of the room into the open air as quickly as possible and at the same time without a large loss of energy. In addition, the room should not cool down much in the cold season to prevent condensation. This requires high-performance exhaust air units that run in an automated manner for short periods of time in full-load operation and then either turn off or run in an energy-efficient base-load mode. Ventilation activation is done by manual on/off or better automatically via pure efficient humidity control.

Yes, the control system detects a momentary high moisture load and automatically activates the ventilation, which quickly and efficiently brings the steam outside. At the same time, however, it ensures that in normal everyday life, ventilation only takes place when the outside air is drier than the basement air. this provides optimal cellar climate.

Yes, individual systems can be realized for both single-family houses and apartment buildings. They are planned individually according to the size and situation on site. In larger properties, where basements are shared by many residents, it is often useful to have more sensors, additional or more powerful ventilation elements, and other controls. Compact single-family basements are individually designed in terms of ventilation to suit the particular use by the homeowners. Where desired and appropriate, they can be integrated with the rest of the rooms in the house in a common ventilation concept or equipped as needed, for example, with a sauna ventilation.

LIMODOR basement ventilation systems are available in a standardized basic configuration as well as in a configuration that can be planned as desired.

Effective dehumidification works only when the humidity outside is lower than inside. The controller uses combined temperature and humidity sensors to detect when optimal ventilation conditions exist. Only then it activates the ventilation. Faulty ventilation is prevented. Another important criterion is the wellness or fitness areas increasingly located in basements. Moisture is typically generated in these, often large amounts in a short period of time as in sauna airing. This must be reliably detected and extracted, ideally without making these rooms uncomfortably cool. At the same time, unpleasant smell of sweat is also removed with and the rest of the storage rooms are protected from mold and cellar stink. The smart control system takes care of that.

A comparison: For 7 minutes, a LIMODOR WC fan needs only 0.7 watts. A 100 watt light bulb for toilet lighting requires 11.7 watts for the same time, which is quickly 17 times as much electricity.

No, because only air is extracted from the room, but no cold outside air is drawn in. The room remains at the right temperature because warm air flows in from the living area.

This depends on the device performance. A simple, low-power axial fan will certainly take longer than a single-pipe fan. A typical LIMODOR toilet aerator takes only 5 to 7 minutes to remove all odors in a common toilet.

Especially with decentralized ventilation systemsoften used in bedrooms, such as the AirVital Prime, a double consumption optimization is given. Firstly, the energy loss compared to opening windows is almost completely eliminated due to an integrated heat exchanger. On the other hand, the built-in fans require minimal energy because they only run when needed and are consumption-optimized. In general, apartment or individual room ventilation saves an enormous amount of electricity in contrast to uncontrolled window opening, as cooling and thus necessary reheating of the room air is prevented during the cold season. Operating time is optimized with intelligent sensors and controls. The energy consumption of the highly efficient fan motors is hardly significant in comparison and is usually even significantly lower than that of the room lighting.

On the contrary! On the one hand, they are not attracted by open windows, and on the other hand, filters are installed in the vents to prevent them from entering. If there is a guarantee of undisturbed sleep without annoying buzzing, it is through ventilation elements.

A function of the control system ensures that air exchange takes place only during cool night hours. An “intensive ventilation” function can also very quickly replace warm, sultry air in the room with cool night air before bedtime. Typical bedroom ventilation systems constructively optimally soundproofed, guarantee whisper-quiet operation and save the decision “fresh air or noise from outside” especially in sultry summer nights.

Optimized sound insulation ensures whisper-quiet operation. Either in the covers and/or as a silencer in the wall opening. This keeps both the noise from outside and the already barely audible noise of the fans safely in check.

This depends on the ventilation system and the tightness of the room and doors. Supply air elements are recommended for well-insulated new buildings. In any case, sufficient supply air must be ensured if there is a fireplace or stove with an open fire in the room. This prevents toxic carbon monoxide, which is produced by a lack of oxygen. Passive supply air elements are generally recommended for modern rooms, which are becoming increasingly tight and better insulated for energy-saving reasons. For example, they also provide constant fresh air without noise, pollutants or insects when opening windows.

This is system and control dependent. Often, central ventilation systems have a very economical base load operation when the occupants are absent, which only takes corrective action for a few minutes to ensure the set room climate parameters. However, these change little in empty rooms. Individual fans or decentralized systems can also be switched off completely as required.

Of course! For example, most controlled ventilation systems have a summer mode that takes into account the active use of a terrace or balcony and adjusts the ventilation function accordingly. In cold or bad weather, on the other hand, the best indoor climate is always ensured without energy-consuming window opening.

In this case, a powerful fan box is the ideal solution, which simultaneously extracts air at several points and brings it outside via poppet valves installed in a central exhaust pipe running across the basement. Dry fresh air enters the basement from outside via a second fan box, a central supply air pipe and poppet valves in the reverse direction. A control system ensures that the ventilation is only activated when ventilation conditions are optimal.

Single-pipe ventilation systems with humidity sensor are ideal for these tasks. They provide efficient venting in the event of momentarily high humidity and activate automatically in normal operation above a certain humidity threshold. This saves a lot of energy. If the room is located in the basement, it can also be integrated into a centrally controlled basement ventilation system, which also ensures optimal and efficient moisture removal.

To ensure trouble-free operation of the supply air unit, the inlet grilles, filters, air ducts and the optionally installed wind or insect screen must be checked for dirt from time to time, cleaned if necessary and replaced if required.

It is recommended to perform a check at least twice a year. If there is a high dust or pollen load or in regions with a high incidence of insects, the inspection intervals must be shortened accordingly.

To ensure a proper and undisturbed air flow, the filter tray must not be covered by furniture, blinds, curtains and similar furnishing elements.
Since a supply air element does not have a heater and fresh air is therefore drawn in at the prevailing outside temperature, it is advisable to position the filter trough close to, ideally above, a radiator. This preheats the airflow during the cold season.

In general, a supply air element can either be installed like a ventilator in a straight wall opening or integrated inconspicuously in the window reveal as a special design with a 90° bend.

AirOnova supply air systems run either as a straight pipe through the house wall or, when installed in the window reveal, as a pipe with a supplementary 90° deflection and a so-called wide duct that is walled into the window reveal.

Starting from the outside, fresh air enters through a ventilation grille. On its way through the tube, it passes an insect screen and an optional wind pressure safety device. Noise protection is made possible by a silencer in the pipe. The fresh air exits through a so-called filter trough on the inner wall. The filter tray contains a filter insert that binds allergens and dust. The outgoing air volume can be infinitely adjusted manually. Drafts are prevented by this system.

The three Decentralized Residential Ventilation Systems available from Limodor are equipped with exhaust air filters and supply air filters. The exhaust air filters prevent dirt (house dust, hair, aerosols, etc.) sucked in from the interior from attaching to the heat exchanger, fan or other components and impairing their efficiency or hygiene. The same applies to the supply air filters.

In addition to standard particle filters, activated carbon filters or fine dust filters can also be used, which separate even much smaller particles. They prevent allergens such as pollen, soot particles and various pathogens from entering the interior with the fresh air. Regular filter checks for contamination or the insertion of new filters is important for full effectiveness. The necessary change is indicated by the devices.

If these simple rules are taken to heart, then compared to uncoordinated window ventilation or cheap fans, decentralized residential ventilation provides very effective allergy protection for the home.

The three Limodor decentralized ventilation systems differ in their design:

The simple AirOdor basically has an axilal fan and a ceramic heat accumulator. During venting, the exhaust air flows over its surface and transfers its heat to it. Depending on the set cycle time, the fan then changes its direction of rotation and draws in fresh air, which passes over the previously heated surface and is thus tempered. Filters on both the supply air and exhaust air sides prevent fouling of the heat exchanger.

The AirVital and AirVital PRIME systems, on the other hand, have a counterflow heat exchanger and two fans. During operation, the supply and exhaust air flows are switched on simultaneously. The specially designed heat exchanger enables the warm air extracted from the inside to continuously transfer its thermal energy to the fresh air intake from the outside. There is no mixing of the two streams. Up to 94.5% energy recovery efficiency combined with minimal electricity costs for the fans in the AirVital PRIME impressively illustrate the energy efficiency of this system.

The central energy-saving element of these comfort ventilation units is the heat exchanger. It provides heat recovery in various construction methods, preserving the vast majority of energy in the house. The exhaust air stream sweeps over the heat-storing surface, releasing its contained energy. The incoming cool fresh air passes over the heat exchanger in the opposite direction and is pleasantly tempered.

This means that when air is exchanged, energy is saved twice: existing heating energy from inside the house is not released uselessly into the environment, as it is when windows are opened. Cold fresh air comes into the house already preheated and does not have to be heated by the heating system, which significantly reduces heating costs in the many cycles throughout the year.

To prevent fire and smoke from spreading through the exhaust ducts of a central ventilation system in the event of a fire, the building code prescribes standardized protective devices tested by independent testing bodies for their function and effect, and installation principles to be observed. These include, above all, cold smoke barriers and fire protection bulkheads or dampers. They are installed in the pipe network, are maintenance-free and automatically and safely close the pipe in case of fire. A suction effect caused by the prevailing temperature-related pressure differences is thus prevented.

Fire protection bulkheads or dampers separate the room affected by a fire by heat-resistantly locking the exhaust pipe leading out of it above a certain temperature, thus preventing the fire from spreading to the rest of the pipe system. Cold smoke barriers prevent the penetration of smoke and vapors in ventilation units in the other rooms. They are closed by a spring as standard and are opened only when the fans are in operation by the airflow leaving the room. This always ensures protection from smoke from the pipe system in areas not affected by the fire.

Single-pipe ventilation systems and fans must be installed professionally and in accordance with building codes to provide this life-saving safety. Fire protection bulkheads and cold smoke barriers are included in Limodor’s product range as accessories and meet the highest safety standards. In the Limodor single-pipe ventilation system, the fire protection devices are already integrated in the fan housing.

The control of a central ventilation system has different functions depending on the specific design. In the AirClean system, the central fresh air supply and several decentralized exhaust air units, such as the Limodor F/M single-pipe fans, are controlled in an optimally coordinated manner for base load operation by a control element mounted in the electrical control box. Demand ventilation, party mode or summer mode are also set via the central control. Exhaust air elements are additionally individually controllable in each room. They can, for example, be switched from base load to full load for a short time in the bathroom by means of a humidity sensor or in the toilet by means of a motion sensor and thus quickly perform their respective ventilation task.

A special case is the AirBase basement ventilation: Here, the controller receives measurement signals from humidity and temperature sensors located in the basement and outside. Depending on these signals, cellar drying is activated when conditions are optimal. But even here, for example with the Limodor F/M-EC single-pipe ventilation system with humidity module, the humid air surge of a sauna can be quickly extracted at full capacity. Mold growth and basement moisture are optimally prevented by this combination of energy-saving base load operation and short-term demand ventilation at full load.

In times of scarce and expensive living space, the basement is increasingly coming into focus as an additional reserve of space. For example, for the home office, but also for a sauna or a fitness room. A well-known problem even in modern houses: Especially in summer, mold or musty smells often form on the cool basement walls due to condensation of moist warm outside air. Simple ventilation is of no use here, it often even aggravates the situation.

The AirBase basement ventilation system therefore works sensor-controlled. Humidity and temperature inside and outside are measured. A smart control unit ensures that only dry outside air enters the house. Humid or odorous indoor air is extracted. This provides optimal cellar drying. Sauna ventilation can also be integrated. Mold protection is thus guaranteed, as is full flexibility in design and operation analogous to residential ventilation.

Compared to uncoordinated, often incorrectly performed window ventilation, any exhaust system, no matter how simple, offers great energy-saving potential. Because fans primarily only run when they are needed. But then they provide a quick and convenient remedy – for example, for odors in the toilet or dampness in the bathroom. Control is via the light switch, timers or automated via motion and humidity sensors. Forgotten windows left open for hours are thus excluded.

Our star in terms of energy efficiency is the Limodor F/M-EC. Its highly efficient but powerful motor, smart controls, and even audible and visual indicators when dirty filters degrade efficiency make it our number one “air conditioning fan.” 40 to 50% power savings compared to conventional systems are easily achievable.

Depending on the type, Limodor exhaust systems offer very high flexibility and ease of maintenance. Many older fan types have been operating for half a century still using the first blower insert. If the blower does become defective, it can be quickly removed and replaced with a new one. The modern click-in system makes fan replacement particularly easy and practically tool-free. Depending on the connection and the selected fan activation – for example via overrun relay, humidity relay, motion relay, door contact or light switch – there is also great variability and exchangeability of the controls for almost all fans.

In the case of the modern top unit, the Limordor F/M-EC energy-saving fan, a smart plug-in board system has been developed that allows conversion to a different activation or a combination in just a few simple steps by replacing these control modules. For example, a two-stage blower insert of a bathroom ventilation system can be equipped with an adjustable overrun relay and a humidity module. This provides optimal ventilation performance and rapid moisture removal combined with automated comfort and minimal energy consumption.

Depending on whether axial fan, centrifugal fan or single-pipe fan, the mounting options are variable. Axial flow fans such as the Limax are typically installed in straight short ducts, such as a bathroom or toilet vent, that pass directly through the exterior wall. Centrifugal fans are also installed directly in the pipe run and are also suitable for longer pipes. However, depending on the structural situation, fire protection elements must be installed separately.

The most flexible is the Limodor single-pipe ventilation system. The fans can be installed as flush-mounted and surface-mounted variants, in and on walls or on the ceiling. They cover all areas of application in the house and also work as central exhaust in the attic, as individual fans, groups or in combination with other ventilation elements.

Ventilation systems are indispensable partners in modern new buildings as well as in renovation projects. Energy efficiency, noise protection, comfort, safety from allergens, fine dust, pathogens or insects – there is a lot to be said for modern ventilation. It is important to always proceed with common sense and to obtain detailed advice.

Sometimes central ventilation or a decentralized residential ventilation system with heat recovery is ideal. The latter is ideal for retrofitting offices or bedrooms, for example, where installation costs are manageable. Sometimes, however, single units in only some rooms such as toilets and bathrooms combined with properly performed window ventilation are an inexpensive, yet energy-saving and comfortable solution. All of these issues are best discussed with the architect or builder and the installer who will design and implement the ventilation layout.

For efficient air exchange, some factors should be considered:

• The position of the fan, e.g. in the bathroom or toilet, should be chosen as close as possible to the point of origin of the humid or odorous air. This increases efficiency and speed.
• Do not mount fans in blind spots or areas where the intake airflow will encounter obstructions.
• Air flowing in, e.g. through doors or supply air elements, should also be able to sweep in the direction of the extraction unit as undisturbed as possible in order to be able to absorb a maximum of moisture, especially in the bathroom.
• In times of increasingly tight rooms and doors, it is essential to ensure sufficient supply air for fireplaces, if necessary by means of separate supply air elements, in order not to produce toxic carbon monoxide.
• Exhausted air should be able to get outside in the shortest and straightest way possible. Any kink or constriction lowers the efficiency.
• Of course, the fan arrangement must not cause any unpleasant drafts.

Sometimes central ventilation is optimal. For example, if it can be planned from scratch for the entire living area in a new building with maximum efficiency. Or as basement ventilation, where a smart control system ensures condensation, mold growth and typical musty basement odors for the entire basement floor under sensor control.

A decentralized living space ventilation system with heat recovery is often ideal for renovations. It is ideal for retrofitting small apartments, offices or bedrooms, for example, where installation costs are manageable. In addition, these systems are very quiet and extremely energy efficient.

Sometimes, however, single units in only some rooms such as toilets, bathrooms, wellness rooms, utility rooms or garages are the best solution. Control modules allow the fans to be optimally adapted to the task at hand and automated. Combined with properly executed window ventilation in the rest of the apartment, this creates an inexpensive, yet energy-saving and comfortable solution.

The advantages and disadvantages, and then the appropriate system selection, are best made together with the architect or builder and the installer who will plan and implement the ventilation design.

Ventilation systems are indispensable partners in modern new buildings as well as in renovation projects, and in times of energy and climate change they are valuable sustainability tools for the environment and the wallet. In order to generate maximum benefit with an economically sensible investment in new construction or renovation, some basic considerations should be made and expert advice sought from ventilation engineers, installers or planners:

• New construction or renovation? In the case of new buildings, optimal ventilation planning and thus full freedom of choice is possible. In the case of refurbishment, the aim should be to minimize the necessary construction work – such as the need to break through walls, the installation work required for pipes and electrical connections, and so on. – for retrofitting. Maximum energy efficiency must of course be ensured. Decentralized ventilation solutions or Exhaust air systems in individual rooms.
• Window opening versus investment for ventilation units: Fans are particularly useful wherever multiple synergies can be utilized. For example, energy efficiency with simultaneous protection against odor, noise, insects or pollutants. Toilets and bathrooms are difficult to ventilate quickly and efficiently by simply opening windows to remove odor or moisture. In the process, they also cool down in the cold season, which wastes energy and makes the indoor climate uncomfortable. An exhaust air system pays for itself particularly quickly.
• Capital expenditure: Centrally controlled complete system for the whole house? Heat recovery? Include basement? Or only ventilation of exposed rooms such as toilet, bathroom or sauna room? With which and how many fans can optimal effect be achieved?
• Maintenance effort: In the case of decentralized, exhaust air and supply air systems, the installed filters must be replaced regularly and, for example, insect screens must also be checked. For some central air systems, additional considerations include sometimes long, hard-to-reach ductwork or regular inspection of the heat pump where present. This increases maintenance costs.
• Operating costs: LIMODOR systems are extremely energy-efficient. However, some systems still run at a very economical base load level all day to ensure a constant indoor climate. Other systems such as single-pipe ventilators can be controlled in a particularly efficient and automated manner via humidity, time or movement modules, so that the additional costs for these components quickly pay for themselves. Economy optimal for renovations are also decentralized solutions with integrated heat exchanger.

A bathroom fan is positioned as close as possible to where the greatest moisture occurs. So, for example, in the area of the shower or the bathtub. The extraction directly at the point of origin prevents the spread of the moist steam and thus quickly ensures a dry bath again. Mounting in “blind spots” should be avoided. It is important that the air in the bathroom from the supply air side, i.e. the bathroom door, can flow as undisturbed as possible in the direction of the fan, absorbing as much of the vapor produced as possible before it condenses. On the one hand, this achieves optimum dehumidification, and on the other hand, the extracted air volume is quickly replaced by an influx of tempered air from the living area. This prevents unpleasant cooling of the bathroom as it is the case when opening the window and thus saves a lot of energy.

This depends on several factors that should be considered before selection and planning: What is the general structural environment, what structural measures are possible at all? House or apartment? Does a family or a single person live here in a small apartment? New construction or renovation? Central ventilation solution for all rooms or individual solutions in single rooms? Which room specifically? Which ventilation tasks and needs (e.g. removal of humidity or odor, fresh air without noise, insects or pollutants, energy optimization…) are in particular focus? How much can be invested financially? How intensively is the apartment used? It is best to list and evaluate these and many other questions in advance. A good initial overview is given by our info section on ventilation systems and/or alternatively on ventilation solutions according to specific living spaces.