Passive Ventilation

Efficient mechanical heat recovery ventilation or MVHR as it is sometimes called, is essential in any building that utilises an airtight passive house system as a suitable source of fresh air is required to permeate through the house. While opening a window does provide a certain level of isolated ventilation, the building’s heat is quickly lost. Heat Recovery Ventilation or MVHR, is an energy recovery and heat exchange, mechanical ventilation system which provides fresh air throughout a passive house. This method of ventilation dramatically improves climate control and air quality, whilst saving significant amounts of energy by reducing heating and cooling demands.

The Heat Recovery Ventilation or MVHR system discreetly supplies a constant supply of fresh heated or cooled air, delivering superior air quality without any unpleasant draughts. This highly efficient MVHR unit allows for the heat contained within exhausted stale air, coming from rooms such as the bathrooms, and the kitchen, to be extracted, cleaned and reused to heat incoming fresh air. Within a Passive House, a minimum 75% of the heat from the exhausted stale air is transferred or ‘exchanged’ to heat the fresh inflowing air by means of the heat exchanger mechanism.