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Old 11-11-2017, 12:36 PM   #4
rohrmann
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Join Date: Oct 2012
Location: Box Elder
Posts: 4,677
M.O.C. #12947
The Atwood manual states these heaters require a minimum 33 square inches for return air. That is just shy of a 6" X 6" hole. Anything less and you will not be getting the most efficiency from these heaters.
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