Critters in Intake / Exhaust PVC
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  1. #1
    Join Date
    Jul 2011
    Posts
    71

    Critters in Intake / Exhaust PVC

    I think the PVC for these high efficiency furnaces is pretty big. 4" maybe?

    Anyone have an issue with critters crawling inside the intake or exhaust pipes? Just curious...seems like the ones I see are all open. If so, how did you resolve the issue and prevent it from happening again?

    Clocker

  2. #2
    Join Date
    Oct 2004
    Location
    So Cal
    Posts
    3,426
    We sometimes install a 1/4" wire mesh "cap" to keep birds out.
    We nearly always use a concentric vent & the bird problems pretty much stopped with those.

  3. #3
    Join Date
    Mar 2011
    Location
    Edna Bay, Alaska Highest concentration of black bears in the US
    Posts
    623
    I once found one tweety bird in the burner compartment, and blew four more out of the the flue. Wasps are a ***** too. If you ever see dead bees in a furnace, you can guess where they came from.

  4. #4
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,627
    Thousands of 90%+ furnaces around here and I've cleaned birds nest out of 2. It's a non-issue IMO.

  5. #5
    Join Date
    Apr 2010
    Location
    Minnesota
    Posts
    515
    We cut a 45 degree slash in the exhaust pipe sticking out the side of the house horizontally. That makes it harder for birds to land in the pipe. Intake should have an elbow facing down. We can't put screens on around here because it's so freaking cold they frost up. We pull out TONS of birds in furnaces usually during the first real cold snap in the fall. Some people stuff a rag or put a plug in the pipes over the summer with good results.

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