exhaust air system

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.