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    oldcootbag's Avatar
    oldcootbag Posts: 4, Reputation: 1
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    #1

    Dec 24, 2010, 06:37 AM
    How many cold air returns do I need in my basement
    I have a finished basement and would like to get a little heat in it. My house is zoned so I would like to tap in the 2nd floor duct with a 6 inch for the basement and then tap into the first floor duct with a 6 inch for the rec room. The rec. room doors are always open. My question is, does this sound like a good plan, and how many cold air returns should I have. Thank you Barry
    joypulv's Avatar
    joypulv Posts: 21,591, Reputation: 2941
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    #2

    Dec 24, 2010, 08:17 AM
    Can your furnace and blower handle all this new space to heat before you get into cold air returns?
    oldcootbag's Avatar
    oldcootbag Posts: 4, Reputation: 1
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    #3

    Dec 24, 2010, 02:59 PM
    Yes I was told it could, especially the upstairs duct because the 3 rooms upstairs are much smaller. Barry
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #4

    Dec 24, 2010, 06:08 PM
    The volume of the supply should be balanced by the volume of the return. Some people put a little more positive pressure rather than negative since that will keep air intrusion down. So, 2X6" returns should work. They should be separated from the supply so you get a good air flow and not short looping and located near the floor level. I would also have a test and balance done afterwards.
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