Importance

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Abstract

A heat exchanger (10) for transferring heat between intake air and exhaust air is disclosed. The heat exchanger (10) includes a plurality of ducts (11) having open first and second ends (11c and 11d). The ducts (11) are connected in a vertical space relationship to one another defining therewith two sets of channels. A first set of channels (11a) being inside the ducts (11) and a second set of channels (11b) being between the ducts (11). Intake air passes through the first set of channels (11a) and exhaust air passes through the second set of channels (11b). The air flow in the second set of channels (11b) is confined. The heat exchanger has a releasably attached bottom (24), whereby when the bottom (24) is released, there is ready access to clean said second set of channels (11b) between the ducts (11). Also, the intake air and exhaust air enter and an exit through their respective sets of channels without mixing. The heat exchanger (10) has an inlet (18a) and outlet (19a) for fresh air in the first set of channels (11a) and an inlet (30a) and outlet (34a) for exhaust air in the second set of channels (11d). Also, in a preferred embodiment, a pressure differential switch (42) is provided for sensing the difference between room air pressure and air pressure proximate the second set of channels (11b) adjacent the outlet (34a) for the exhaust air.

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First Claim