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  1. #1
    Join Date
    Aug 2004
    North Richland Hills, Texas
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    Bt it's worked fine for 15 years!

    5 ton furnace with a 20x20x1 filter rack screwed onto it, the rest of the opening panned off with sheet metal.
    For an extra bonus, 1/3 of the filter rack also panned off with metal!

  2. #2
    Join Date
    Dec 2011
    Grass Lake, MI
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    And the Delta P is? That had to be some CRAZY static pressure! "But Mr. Service Tech, I haven't had a single problem. It's worked fine since the day of installation."

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