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Thread: return air

  1. #1
    Join Date
    Jul 2008

    return air

    dumb question maybe, is it better to have or add addtional return air to a system. can you add too much return?


  2. #2
    Join Date
    Aug 2002
    Office and warehouse in both Crystal River & New Port Richey ,FL
    the riot,

    More return duct and return grille location,will lower the static,and provide better room to temps(being closer to the same),if designed properly.

  3. #3
    you can not have to much return air you can have it to small or in all the wrong places, you must understand the unit suplying the air has a fan that will blow so much cfm. your duct suply is design to move so many tones of air per hour, the fan in your unit onley blows air, it does not suck air, the return air is the amount air that is replaced and since you fan does not suck. the duct work has to be larger than the suply. so it can replace the air that the fan has removed,and the air is naturally replaced, thats why the duct is bigger then the suply, now if you whant to know if you have the correct size duct for your return get a duct calculater and fined out what your tone is divide that by 400 and that will give you your cfm out put and read the directions on your ductulater and you will fined the size return you will need to have for your equipment, over sizing the return would be a wast of monney. use the proper size return, best of luck to you ..

  4. #4
    Join Date
    Dec 2007
    Afton, VA / Khorat, Thailand
    The key being properly designed....
    Tough times don't last...Tough people do.

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