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    tomron's Avatar
    tomron Posts: 1, Reputation: 1
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    #1

    Jan 2, 2008, 03:48 PM
    Furnace efficiency
    I have a Concord hi efficiency furnace (125 BTU). It is piped with 3-inch supply and 3-inch exhaust rather than the 2-1/2 inch as recommended in the installation manual. Will this affect the efficiency?
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
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    #2

    Jan 2, 2008, 04:08 PM
    There may be a slight decrease in efficiency only because of the surface area exposed to the cold conditions. I would be more concerned about the proper back pressure in the exhaust system. If your venting system contains more than 2 90 degree elbows, you should be all right.
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