i had a new trane 3.,5 a/c and air handler tec3f42-sf-1d installed.the air handler is sweating.it is wet inside, they increased air speed , no good what size return is the correct one.

Asked by michael powers on 07/21/2011 1  Answer

ManualsOnline posted an answer 13 years, 2 months ago

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0 18" round, minimum. Be careful, 2x 9" rounds dont make an 18", Use PI x R squared
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