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  1. #1
    Join Date
    Jan 2009
    Posts
    1

    Unhappy Furnace Closet Ventilation

    Hello,

    My forced air NG furnace is installed in a closet. There are (2) 4 inch stove pipes that are also in the space that pass through the ceiling and ventilate into the attic. One opening is flush with the ceiling and the other opening is 24" from the floor. Needless to say I'm loosing a whole lot of heat. Is that much flow actually required? Is there anything I can do to mitigate the amount of air flow? Thanks
    Last edited by fweiland; 01-04-2009 at 09:01 PM. Reason: missed words

  2. #2
    Join Date
    Feb 2008
    Posts
    556

    Default Re: Furnace Closet Ventilation

    Yes, that much flow is required & has to be maintained.

    The stove piping's main job is to PROVIDE SUFFICIENT AIR to the gas burners in order to burn the NG.

    It takes 24 cu.ft. of air to burn one cu.ft. of NG---any restriction in this air amount will result in poor combustion & a dangerous situation.

    Consult your local heating contractor (oil burner techs are also licensed to do gas heating)---they have sidewall vent systems (if the closet is next to an exterior wall), or in-line auto draft inducers that will vent thru the roof or (if you have one) a chimney, the open vents could be then closed off.

    This could get expensive, so ask for several quotes.

    Can't you just keep the closet door insulated & closed during the heating season??
    Last edited by NashuaTech; 01-05-2009 at 08:25 AM.

  3. #3
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,661

    Default Re: Furnace Closet Ventilation

    Since the furnace closet has supplemental ventilation to the outside, you should make the closet otherwise airtight. This means weatherstripping the door and sealing any penetrations in the wall, floor, and ceiling, and sealing and insulating the ductwork in the closet. You might even place insulation board on the walls of the closet. This should mitigate most of the heat loss you are experiencing; any heat loss you do see afterward would probably be due to radiant losses from the furnace itself and the surrounding walls.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  4. #4
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Furnace Closet Ventilation

    You say both these "vents" terminate IN THE ATTIC? Are they open to the attic space, or do they go through the attic penetrate the roof or side wall and reach the OUTDOORS, or connect to a device - like a heat recovery ventillator - that then is connected to the OUTDOORS?

    One opens near the ceiling of the closet and the other one near the floor?

    No mention of a chimney or exaust flue.

    Consult with a licensed HVAC technician on-site, your gas fired heating appliances should be cleaned, inspected and checked for tunning annually (preferably at the beginning of the heating season) and bring these to the tech's attention and inquire, make sure they check the terminations and draft. Then follow recommendations from the technician.

  5. #5
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,661

    Default Re: Furnace Closet Ventilation

    I agree, Chicken Little, that the vents should extend to the outside so as to prevent the potential buildup of gases in the attic. But I think the exhaust flue is implied.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

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