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I don't know where to put a filter in my coleman furnace since the metal door is the vented source. In the top, in the
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Amazon.com: Duraflow Filtration Mobile Home Foam Filter - 19 x 35 x 1/4 - Compatible with Coleman (Model # 7660-3401, 7660-340 and Nordyne (Model # 669073 & 669073R) - (2-Pack) : Duraflow Filtration: Health & Household
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