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  1. #1
    Join Date
    May 2005
    Posts
    10
    How much cfm does a 14 and 16 inch pipe pull and how much cfm return air do you need for a 2.5 ton unit?

  2. #2
    Join Date
    Aug 2001
    Location
    forney texas
    Posts
    17,890
    at 400 cfm per ton to get 1000cfm out you will need to get 1000cfm in.

  3. #3
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,381

    Frown A.H.U.

    Originally posted by jel
    How much cfm does a 14 and 16 inch pipe pull ...?
    I always thought the Air Handler blower did the "pulling", NOT the duct.

    Who actually uses PIPE in their A/C air distribution systems?

    16" flexible duct can handle ~ 900 CFM on the return side. A little More if the length is very Short.

    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  4. #4
    Join Date
    Oct 2004
    Posts
    1,722

    Re: A.H.U.

    Originally posted by dan sw fl
    Who actually uses PIPE in their A/C air distribution systems?
    I do.
    Get back to work.™

  5. #5
    Join Date
    Mar 2004
    Location
    Niceville,Fl.
    Posts
    65

    How much cfm does a 14 and 16 inch pipe pull and how much cfm return air do you need

    The flexible duct will handle less then a lot of people seem to give them credit for. The 16 will handle about 1000cfm's at .02" of static pressure , depending on the length as Dan says. If you have a 14 and 16 on a 2.5 ton system you have enough depending again on the length and the path the duct takes straight line is the shortest distance between two points. It's also the best way to run any duct especially flex.
    Too Old to be doing this

  6. #6
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    where are you getting this pipe? I did not know pipe could pull anything!

  7. #7
    Join Date
    Oct 2004
    Posts
    1,722
    Originally posted by cem-bsee
    where are you getting this pipe? I did not know pipe could pull anything!
    I know...it's crazy.

    It's special pipe.
    Get back to work.™

  8. #8
    Join Date
    May 2005
    Posts
    10
    I'm sorry. I am just a home owner trying to determine if I have enough return air. I have a moldy smell coming out of my unit that is making me ill and I am trying to figure out what is causing it. I have had people check it and they say nothing is wrong. I was just wondering if maybe I did not have enough return air. I have 14 inch flex duct to a 20x20 filter and 10 inch flex duct to a 14x20 filter. I just wanted to know if this was adequate. Thanks.

  9. #9
    Join Date
    Sep 2004
    Posts
    3,157
    I know of a company that has 2 locations-one in la and one in sacramento that MAKE sprial PIPE---Its special pipe alright and it takes a special machine to roll the pipe and fold and lock the seams then part the pipe in 10 ft sections

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,586
    Ct2, their talking about that new magic pipe. You just put it in the house, and it pulls air, no a/h needed.


    Jel, have they inspected your supply and return ducts for mold.

    Consider having a UV light installed in your system.

    After having any contaiminated ducts cleaned, or replaced.

    Also, use biocide air filters.
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  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,586
    Your return is ok, depending on length, and number of turns, and bends.
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    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Nov 2000
    Location
    Coastal Georgia
    Posts
    34,902
    If you grease the inside of the pipe, it will pull more.

  13. #13
    Join Date
    Mar 2004
    Location
    Niceville,Fl.
    Posts
    65

    Professional mambers

    Don't think the home owner came in here looking for a hard time. Thier just looking for some insight.
    Too Old to be doing this

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