单词	air exchanger
释义	air exchanger noun : a ventilation and climate control system or device that exchanges air inside a building with fresh air from outside the building and that typically transfers heat between the outgoing and incoming air in order to reduce the energy required to maintain the building's indoor temperature An air exchanger is often added to the ductwork of tightly built houses that have only minimal ventilation. Ultimate Guide to Home Repair and Improvement, 2006 Word History First Known Use 1876, in the meaning defined above
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