Ventilation system
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United States of America Patent
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May 10, 2005
Issued Date -
N/A
app pub date -
Jan 8, 2002
filing date -
Oct 24, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for ventilation systems which include an element for the transfer of heat from warm exhaust air (taken from inside a building) to cooler exterior fresh air which is drawn into the building. During a defrost cycle, interior air may circulate through both of the fresh air and exhaust air paths for delivery back into the building, i.e. the warm interior air, used as defrost air, may be able to circulate from the interior of the building into the ventilation apparatus and back to the interior of the building. The apparatus can thus use interior air as defrost air while diminishing or avoiding the creation of a negative air pressure in the building.
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