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-   -   How to convert standard exhaust to forced exhaust (https://www.askmehelpdesk.com/showthread.php?t=575643)

  • May 10, 2011, 02:14 PM
    ggonzales1017
    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
  • May 10, 2011, 02:54 PM
    ma0641
    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?
  • May 10, 2011, 03:03 PM
    ballengerb1

    I agree, no can do. Exhaust temps are too high for an 80% furnace, it would melt the PVC
  • May 10, 2011, 03:29 PM
    ma0641
    Comment on ballengerb1's post
    2 great minds working as 1!
  • May 10, 2011, 07:27 PM
    KC13
    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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