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Correct duct size

I am currently working on a job that appears to have the supplt & return ducts chocked down considering the size of the unit.Can I get the name of a good website or a rule of thumb when it comes to CFM & suitable duct size.thanks in advance for the help!!!!!!!!

Comments

  • meplumber
    meplumber Member Posts: 678
    Ductulator

    Get yourself a good Ductulator. I have been designing duct with mine for years.
  • Techman
    Techman Member Posts: 2,144
    edited August 2011
    Ductulator's

    Also track down a  flex duct Ductulator for flex duct.
  • TonyS
    TonyS Member Posts: 849
    Duct sizing workbook

    This is a handy notebook

  • Techman
    Techman Member Posts: 2,144
    Duct sizing

    Hi TonyS. I like that HandBook way of looking at ducting,thanks .There is a lot of 8" high supply trunks in residential. But, on the return duct sizing we try for .08"w.c. depending or .06"w.c. depending. Our returns are larger than our supplies.
  • TonyS
    TonyS Member Posts: 849
    Your welcome Techman

    I use that book when I am coming out of boiler mode. I find as I get older I still have a good memory except its alot shorter LOL
  • Techman
    Techman Member Posts: 2,144
    TonyS

    I just looked at your photo in the "contact user" section . I have two questions , one personal and one business. Business first , Is she your helper ? Now personel , Where do you keep the pipe wrenches? LOL ,with you I hope!!!!!!!!!!!!
  • meplumber
    meplumber Member Posts: 678
    Thanks Tony.

    That is a mighty handy cheat sheet. I feel your pain. Things don't come out of the old Noggin' as fast as they used to.
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