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  1. #14
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,484
    They appear to be 10" OD flex pipes. That's about 1,000 cfm, (flex is more restrictive to the airflow) or 600 cfm short. Based on the blowers capabilities, 1,600 cfm of return air (at .08 static) is desired.

  2. #15
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,484
    Quote Originally Posted by 545GAlady View Post
    Did I ever mention that the air rushing through the returns are sort of noisy?
    That could be a sign of restriction.

  3. #16
    Join Date
    Sep 2012
    Posts
    373
    Thanks for the information. I'll measure to make sure sometime. We do plan to replace the furnace next winter and we want to downsize, but since the heat pump is 3.5 tons, we'll still have to have a furnace with a 4 ton blower installed. Hopefully we can find a GOOD company to install the furnace and redo the ductwork as necessary. I don't think the company who installed the heat pump did a manual j. The old A/C was a 3.5 ton as well.

  4. #17
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by George2 View Post
    That could be a sign of restriction.
    Probably so. You can't hear the noise unless you are standing right in front of the grilles.

  5. #18
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,484
    Quote Originally Posted by George2 View Post
    They appear to be 10" OD flex pipes. That's about 1,000 cfm, (flex is more restrictive to the airflow) or 600 cfm short. Based on the blowers capabilities, 1,600 cfm of return air (at .08 static) is desired.
    I re-read this post.........I meant to say 10" ID (inside dimension). Sorry.

  6. #19
    Join Date
    Sep 2012
    Posts
    373
    That's okay. I knew what you meant anyways.

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