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The check valve is designed for all Ø120mm airRoxy fans in the series pRim, pRestige, pRemium and aRid (see accessories). The ventilation element to prevent from backflow of the air into the room.It is assembled on the fan flange.It prevents from penetration of pollutants from the vent flue to the ventilated room.The check valve provides the air flow in one direction only, without reducing significantly the efficiency of the fan.
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