How To Select A Suitable Home Ventilation System

A good heat recovery ventilator can recover up to eighty-five percent of the outgoing air. In very cold weather, frost can easily accumulate at the center of heat exchange. The ventilator is built to deal with this problem by shutting out the cold incoming air for some minutes. It allows the warm air to run through the exchange center until the frost melts away, then ventilation continues normally.

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