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Registered
Join Date: Jun 2007
Location: Lake Oswego, OR
Posts: 6,043
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Not an expert. Did this restrict the sizing of the duct work? If so, I would reject it.
The gold standard for duct sizing is Manual D. This is published by ACCA. I have been on the board of my local ACCA association for over a decade. Get the opinion of a contractor who uses Manual D and you will have the correct answer. This is science. There are correct and incorrect answers.
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