Thinking about hooking up my cold air return

ikessky Posted By ikessky, Aug 20, 2013 at 10:19 AM

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  1. ikessky

    ikessky
    Minister of Fire

    Sep 2, 2008
    862
    24
    Loc:
    Northern WI
    Up until now, I've left the filter box on the back of my add-on furnace open and just pulled basement air. Lately I've been thinking about hooking the add-on furnace to my existing cold air return. My question is regarding backdraft dampers. Do I really need on in the way of the NG furnace. Attached is a picture of the current duct work. My thought is to just put a 12" return in the overhead duct work. My concern with not doing a damper is that I don't want to pull warm air down over my AC coils, short cycle my system, and not get heat upstairs. (I already have dampers in the supply pipes so that my AC doesn't cool the basement).
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