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    jstewart007's Avatar
    jstewart007 Posts: 7, Reputation: 1
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    #1

    May 19, 2008, 04:17 PM
    I want to move the return
    Hey doing kitchen remodeling and I need to move the return.


    In my basement ceiling they had the return going up into the rafters with a sheet of sheet metal nailed across them to seal it off. Then a hole in the floor leading into a cavity that was built out of drywall, this is what I'm removing, then into a duct in the kitchen ceiling leading into the upstairs walls. My question is can I take the duct leading to the upstairs and run it through the kitchen ceiling then down almost right over top of the furnace. How will this affect the flow going to the furnace, just running it in duct instead of a wall cavity? I think its fine I just want to make sure... the air flow in the house sucks anyway I'm thinking this may make it better since the duct will be sealed better than the wall cavity? Any opinions or pointers are greatly appreciated
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    May 19, 2008, 05:51 PM
    Cross sectional area should remain the same or larger.

    Frictional loses are dependent on the kind of duct and the length. A real duct will have less loss than a wall cavity. There should be a return in most rooms. Bath is a definite exception.

    Usually modifications to the duct work has to be approved by the AHJ and you need a building permit.

    Want to do it right then look up "manual D" for duct sizing.
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