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    cesar44's Avatar
    cesar44 Posts: 12, Reputation: 1
    New Member

    Apr 12, 2011, 05:05 AM
    How to calculate the air supply size for a room, according to duct size?
    I have a 4 ton central heating and a/c. My bathroom was remodeled and now is 66 sf. My existing flex duct to the bath is 7" DIA.
    Can I use a 12x4 supply boot with a 7" duct, or do I have to change the duct size?
    How can I calculate the size of a supply boot according to duct size?
    KidChaos's Avatar
    KidChaos Posts: 45, Reputation: 3
    Junior Member

    Apr 12, 2011, 10:43 AM
    I wouldn't worry about this 66 so ft, and 12 x 4? a 7 inch duct is huge for any bathroom, just be sure that the flex ducting is taught and without sags or bends, they must be taut and straight.

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