Quote:
Originally Posted by OldWEB
The OP reported he has the DFM35 model and that requires min. 48 in² according to the manual; that is 4 - 4" ducts. It also says to have min. of 65 in² of return air area. So if he can finagle the vents to accommodate the requirements...
One thing that was mentioned is to look for collapsed or extra length of ducts that could be shortened.Many report problems with ducts.
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I apologize - I missed the reference to the DFM35.
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