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    ggonzales1017's Avatar
    ggonzales1017 Posts: 1, Reputation: 1
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    #1

    May 10, 2011, 02:14 PM
    How to convert standard exhaust to forced exhaust
    I have an 80% efficiant forced air furance in good woorking condition and wood like to change from b vent exhaust to a pvc forced air exhaust
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    May 10, 2011, 02:54 PM
    Not sure you can do that on an 80% unit. 90%+ works OK but your flue vent temp may be too high. Why the desire to change?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    May 10, 2011, 03:03 PM

    I agree, no can do. Exhaust temps are too high for an 80% furnace, it would melt the PVC
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #4

    May 10, 2011, 03:29 PM
    Comment on ballengerb1's post
    2 great minds working as 1!
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #5

    May 10, 2011, 07:27 PM
    Quote Originally Posted by ggonzales1017 View Post
    i have an 80% efficiant forced air furance in good woorking condition and wood like to change from b vent exhaust to a pvc forced air exhaust
    Indeed... why? Flue gas temperatures from a non-condensing furnace are too high to be safely vented with PVC. What is the problem with your existing B-vent?
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