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Old 09-29-13, 06:17 PM   #40
Xringer
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Yeah, one of these would allow us to suck in some cold outdoor air,
and heat it up some, by stealing the heat out of the air we are pumping outdoors..
That diamond shaped box in the middle is an air-to-air heat exchanger..

Works the same way in the summer, but does the opposite. Cools off the incoming hot air.

It's a way of getting fresh air in your house, without wasting too much AC or heat..
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