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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.

Credits: ADEME


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