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

    Sep 19, 2012, 12:04 PM
    What size exhaust pipe do I need of 7500 in 5900 BTU out gas furnace?
    What size exhaust pipe do I need for a 7500 in/5900 out BTU gas furnace plus a 40 BTU hot water heater, in a 2000 square foot house?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Sep 20, 2012, 04:57 AM
    Think your numbers are off. Never saw a heater or hot water heater with BTU ratings that small. However, the heater manuals should tell you what you need.
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