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The OP reported he has the DFM35 model and that requires min. 48 inē according to the manual; that is 4 - 4" ducts. It also says to have min. of 65 inē 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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