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  1. #1
    Join Date
    Mar 2004
    Location
    OKC
    Posts
    41

    Help with balancing my duct work..

    Okay guys I'm a pro, But I do commercial refrigeration. So I don't know a whole lot about duct work and such. Here's my issue. One side of the house is comfortable, and the other side always is the opposite. I don't have duct work collapsed. I have a 4ton lennox. How can I test to see if I have too much air pressure on one side instead of the other. What should I see coming out of the returns CFM wise. Thanks guys.

  2. #2
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,635
    Move to bldg sci thread?
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,808
    Use a manometer to measure the static pressures. the returns should be bringing roughly 1600 CFM back to the furnace/air handler.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Dec 2010
    Location
    WV
    Posts
    114
    can u give a more detailed description of system....... lennox XP 13? 14? 15? split system? pack? A/c only? heatpump? gas? duct design??? RA air sizing?

  5. #5
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,635
    ...System location in home, location of problem areas (relative to system), cycle times, problem description, size of house, insulation levels,...
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  6. #6
    Join Date
    Sep 2003
    Location
    Portland.OR
    Posts
    311

    I vote for poor return on that side.

    Thats what I see from here!! So confirm that there is more than one
    return? It it a ranch or big up/down layout?

    poor man test-- is tape a piece of paper at the register and measure how
    far it blows up from the floor!! Course that couldnt be you if your
    a commercial refer guy!! [laugh here]

    Please get back to us and tell us what you did to fix it.

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