Humidity is released here: Up to 15 litres a day in a 4-person household.


Moisture loss in a 4-person household

Statutory requirements stipulate a minimum air change rate

EnEV specifications go so far as compelling building owners to guarantee an adequate minimum air change rate in their buildings. Residents are usually out of the house during the day, which means that the necessary ventilation does not take place. A mechanical ventilation system operates continuously, thereby preventing adverse effects for residents as well as damage to the building.

Allergy sufferers can breathe more easily

Allergy sufferers really appreciate mechanical ventilation systems: Fitted with effective pollen filters, they reduce the pollution level so those affected suffer less from allergic reactions, while still being able to breathe fresh air.

Centralised ventilation in new build

Many modern buildings are built with mechanical ventilation systems installed. On the one hand, this requires a high level of energy insulation in order to regulate indoor air humidity as effectively and reliably as possible. On the other, it is regarded as a comfort feature for well equipped apartments or buildings.

Mechanical ventilation in detached houses

The installation of mechanical ventilation systems in new detached houses is already standard, especially in low energy and passive houses. Consequently, no heat is lost through accidental ventilation in the colder months, and the continuous air change ensures a consistently high level of indoor air quality.


Heat recovery from extract air

Advanced mechanical ventilation systems are particularly energy efficient: A powerful heat exchanger recovers up to 98 percent of the latent heat in the extract air and uses it to heat incoming fresh air. This reduces household expenditure perceptibly thanks to a significantly lower energy demand. It also means a reduction of CO2 emissions.

Every new building equipped with mechanical ventilation has a central unit that supplies all rooms with fresh air via a duct system. In most cases, the duct system is concealed in the floor or integrated into the walls. Air vents are all that remain visible. The air change rate is regulated automatically by the central ventilation unit.


Ventilating rooms individually

Ventilation units can be installed purposefully in specific rooms. All that is required for a straightforward installation is a wall outlet or a hole through the exterior wall of the respective room and a 230 V power supply.

No ventilation ducts need to be installed for this system. Residential units can be equipped with several units that operate independently from each other. These are ideal for providing a comfortable ambience with the required minimum air change rate. These units feature a heat recovery level of up to 90 percent.

Mechanical ventilation Behagliches Raumklima und Schutz der Bausubstanz

Viessmann mechanical ventilation systems are characterised by their innovative technology. They are durable, reliable and operate particularly quietly. With different equipment levels, they can be employed flexibly in the widest range of applications imaginable, no matter whether in a new building or the modernisation of an existing building.