Our glossary contains the most important terms from ventilation technology. Search and find made easy.
Air exchangeVolume of air exchanged per hour for a room in 1/h.
Air volume flowFlow of air conveyed by the AHU in m3/h.
BypassThe bypass bypasses the heat exchanger of the ventilation unit (summer operation).
Cross ventilationFree ventilation from one side of a building to another, through e.g. joints or open windows, mainly caused by wind pressure.
DehumidifyDecrease the absolute humidity of the air.
Dew pointAir condition in which the air can no longer absorb water vapor (100% relative humidity). If the air temperature is lowered further in this condition, condensation or condensation water formation will occur.
DiffuserDevice through which the air flows into or out of the room (valves).
Exhaust airThe amount of cooled exhaust air discharged to the outdoors.
Exhaust airExhaust air is air discharged from the room.
Heat exchangerComponent for the recovery of heat (partly also moisture). Plate heat exchangers and rotary heat exchangers are mainly used for residential ventilation systems.
Heat recoveryMeasure for the reuse of thermal energy of the exhaust air.
Humidity, relative (relative humidity (RH))Ratio of the instantaneous water vapor content of the air, relative to the highest possible value at the corresponding temperature [in % r.F.].
InfiltrationAir volumes entering and leaving through leaks in the building envelope.
Intensive ventilationTemporarily increased air flow to reduce an increased moisture or odor nuisance (cooking, party,..).
Joint ventilationFree ventilation through structural joints, e.g. windows and doors, due to wind and temperature differences.
Minimum air exchange rateMinimum air exchange rate prescribed for physiological reasons.
Nominal ventilationNecessary air volume flow according to DIN 1946-6 to guarantee the hygienic requirements as well as to ensure the protection of the building when the users are present (normal operation).
Outdoor air volume flowAll fresh outdoor air drawn in from outdoors [in m3/h].
Overflow areaArea between the supply air spaces and the exhaust air spaces through which the air flows from the supply diffuser to the exhaust diffuser.
Shock ventilationBriefly opening windows and/or doors to quickly exchange air in the home.
Supply airAll preheated air supplied to the rooms [in m3/h].
VentilationExchange of indoor air for outdoor air.
Ventilation according to demandFan-assisted ventilation, where the air volume is adjusted to the demand (present, absent, intensive or party) (manually or automatically).
Window ventilationExchange of room air with outside air only through open or tilted windows, air exchange is uncontrollable.