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mobile home downflow furnace has a filter on top should there be a vent grille installed above the furnace? it is currently sealed above. : r/hvacadvice
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Amazon.com: Mobile Home Furnace Foam Door Filter - 16 x 26 x 1/4 - Compatible with Many Miller, Nordyne, Nortek, Intertherm, Broan and Maytag Furnaces (2-Pack)
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