Double-flow controlled mechanical ventilation (CMV)
A double-flow controlled mechanical ventilation (CMV) system is used to limit heat losses due to ventilation: it recovers heat from waste air extracted from the home and uses it to warm fresh filtered air from outside. A fan blows fresh, pre-heated air through the main rooms through air vents.
This equipment is more expensive than a single-flow controlled mechanical ventilation (CMV) system, but it provides significant heating savings:
- by recovering up to 70% (90% for high performance systems now available on the market) of the energy contained in the extracted waste air;
- by using heat released from cooking or the bathroom.