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Answer: in damp rooms.
A single-flow CMV has exhaust vents to remove stale air and air inlets to bring fresh air into the home. With a double flow VMC, the air inlets are replaced by air intakes which force the arrival of fresh air. The extraction vents must be placed in damp rooms: bathroom, kitchen, laundry room, WC, etc. They must be installed high just above the stove or the bathtub so that they can immediately catch the water vapor, so ideally at the top of the wall or in the false ceiling. The air intakes must of course be drilled above the windows. For double-flow CMVs, air vents must also be installed in all living rooms: living room, bedrooms, etc. You too, send us your brico question