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  1. #1
    Join Date
    Aug 2007
    Posts
    72

    Furnace Questions

    I have a standard efficiency gas furnace that is nearly 20 years old.

    The furnace has a regular exhaust vent that goes to the roof. There is an open 12-inch duct near the furnace which I’m guessing is combustion air supply from somewhere up above, probably the attic.

    Two questions

    (1)
    This is a 2-story house and the furnace is in the basement. There are loose gritty grains on the furnace under the exhaust vent connection. These are apparently forming on the inside of the exhaust, because tapping on the exhaust vent causes them to break loose. Is this a reason for concern?

    (2)
    It won’t be too long until we replace this furnace. If I want to upgrade to a high-efficiency model, what modifications will be required to the exhaust vent? There does not appear to be a good place to exhaust to an exterior wall.

  2. #2
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246
    Quote Originally Posted by PowerPlay View Post
    (1)
    This is a 2-story house and the furnace is in the basement. There are loose gritty grains on the furnace under the exhaust vent connection. These are apparently forming on the inside of the exhaust, because tapping on the exhaust vent causes them to break loose. Is this a reason for concern?

    [COLOR="Green"]It is asbestos pellets called virmiculith, and it is insulation arround vent.(speeling is close)and should be changed out.[/COLOR]

    (2)
    It won’t be too long until we replace this furnace. If I want to upgrade to a high-efficiency model, what modifications will be required to the exhaust vent? There does not appear to be a good place to exhaust to an exterior wall.
    If you have nothing going up chimney besides furnace you can use that. Installers are good and they should be able to find a place.
    Do it right the first time.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,095
    Post pics of the current set up.
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    How many times must one fix something before it is fixed?

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