The unit warms incoming fresh air using heat from air exhausted from the building, and circulates it to the rooms through a ductwork system
The unit has a counter-flow heat exchanger by which the unit uses approximately 95% of the heat of the air that is blown out, to heat up the fresh air from outside. Each unit has a unique mechanism to prevent the unit from freezing. The unit also incorporates a summer bypass valve, so that when the user selects a cooler temperature it bypasses the fresh incoming air away from the heat exchanger to provide unheated fresh air.
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