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Thread: cfm for ac

  1. #14
    Join Date
    Jun 2007
    Location
    louisville ky
    Posts
    107
    Quote Originally Posted by furnacemaninc View Post
    if you return is to loud from being to short. have a company line you return can with acustical insulation, it will reduce the noise by at least 30%.it only takes about a hour or two of labor and the material is cheap
    they put what looks like bubble wrap with aluminum foil on both sides of it on the inside of it. the intake is only about 6 inches long

  2. #15
    Join Date
    Mar 2004
    Posts
    60
    boy i love lack of return air and excessive fpm across filter grill

  3. #16
    Join Date
    Jun 2007
    Location
    louisville ky
    Posts
    107
    Quote Originally Posted by dezerttech View Post
    boy i love lack of return air and excessive fpm across filter grill
    im not a pro but i think i have a lot of return air. i have a 14x25 on the side of the furnace and 4 6inch in the bottom of the furnace. what is fpm

  4. #17
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by chrism9232 View Post
    what is fpm
    FPM is a measure of velocity...in this case air velocity in feet per minute (speed of air).

    Where CFM is a measure of volume in Cubic feet per minute (amount of air).

    If you know one of these and the square feet of duct area the air is traveling through....you can calculate the other.

    Key1

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