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  1. #1
    Join Date
    Jul 2008
    Posts
    12

    oversized supply duct

    can the supply duct be too big?, say current set up for 3 ton, changed to 2 1/2 ton.

  2. #2
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Not likely,in the senario,if it's an issue,just add a damper or other restriction to raise the static.

  3. #3
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,956
    The ductwork may have been undersized for the 3-ton unit.
    The half-ton less is inconsequential, & may improve operating efficiency.

    When one gets to the larger 3.5 to 5-ton equipment, doing whatever is necessary toward downsizing tonnage is very important, so that the duct system won't be undersized!

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