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  • Installing cold air returns in basement

    I am installing cold air returns in my basement. Is it OK to tap into an existing cold air return panning that feeds a cold air return to the main floor or must I come off the trunk line?
    Last edited by khe; 01-31-2012, 01:44 PM.

  • #2
    Re: Installing cold air returns in basement

    first your wording is off a little you have a supply and a return not a cold return

    not knowing how big or how many panning returns you have it is hard to say yes or no , if you cut into one and make it to big you will be taking to much air from the basement and then you will not be returning the air from where it was intended to return air from
    if you go back to the trunk line you will be doing the same to all your returns in the house

    why do you need a return in the basement , are there any supply vents down there
    Charlie

    My seek the peek fundraiser page
    http://observatory.mountwashington.o...nal&fr_id=1040


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    • #3
      Re: Installing cold air returns in basement

      Thanks for the reply.

      There are supply ducts in the ceiling. I am finishing the basement and want to put the supply ducts on the wall down low near the floor and install return ducts. The supply ducts are 2x10" and I will put extruded styrofoam between the concrete and the supply duct.

      The panning return that I was thinking about tapping into only is connected to one return duct on the main floor.

      Should a damper be installed in the return in order to control the amount of air returned as not to take too much air from the main floor?

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      • #4
        Re: Installing cold air returns in basement

        We would never use an existing return meant for another room, to return a different room. Like Hawk said, you're going to rob the other room in which it was intended for.

        Depending on how big your basement is, and how many rooms you're making, you most likely will be able to use 1 big return grille for the basement only. Keep in mind that air does circulate underneath doorways and will be "pulled" to the return. I think if you have too many returns, it's going to unbalance the system.

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        • #5
          Re: Installing cold air returns in basement

          I am finishing two rooms - one is 39'x13' and the other is 26'x11' and they share a common wall that is a load bearing wall. I plan on putting two return air ducts for each room in the common wall. I am able to get the return air into the center wall without cutting the top plate (my trunk lines run near the center wall and I can use panning and an elbow to get the return air duct into the wall below the top plates).

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          • #6
            Re: Installing cold air returns in basement

            im not up on small house units so Flux is better to help you on this one

            my house is small and i only have 1 return in the center of the house .the kids keep there doors closed all the time but there is enough space under the door for the return air to pull under the door
            Charlie

            My seek the peek fundraiser page
            http://observatory.mountwashington.o...nal&fr_id=1040


            http://www.mountwashington.org/weather/conditions.php

            new work pictures 12/09
            http://public.fotki.com/hvachawk/

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