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  1. #1
    mathew stouffer's Avatar
    mathew stouffer Guest

    Default Gas company red tags furnace

    Got a call the other day asking me to verify if there was enough combustion air in the attic for a furnace located in the space. They said the gas company red tagged the furnace and shut if off because they 'thought" there was not enough combustion air. Have you ever heard of this. I asked if the guy performed any calculatons to determine the amt of combustion air, she said nope. Ever hear of this.

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  2. #2
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    1,984

    Default Re: Gas company red tags furnace

    On an attic furnace, No. On various furnaces and water tanks stuffed into closets with solid doors, Yes.
    I don't know what it is like around there but here the gas company errs on the side of caution. Any signs of flame roll out or excess confinement and they will shut it down. He may have looked up there and seen bad signs with the unit or no attic venting at all. Flame roll out, insulation/wood contact etc. The combustion air might have just been a quick excuse.
    I've done such inspections. Sometimes I can specify the problem, other times its a matter of just documenting a bunch of various problems.
    Attic furnace there's bound to be a bunch of issues.

    www.aic-chicago.com
    773/844-4AIC
    "The Code is not a ceiling to reach but a floor to work up from"

  3. #3
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
    Posts
    1,363

    Default Re: Gas company red tags furnace

    I have heard of this. If the attic is poorly ventilated then you can't use it for a furnace's combustion air source.

    Eric Barker, ACI
    Lake Barrington, IL

  4. #4
    Join Date
    Dec 2007
    Location
    Holladay, UT
    Posts
    565

    Default Re: Gas company red tags furnace

    Mathew, Was the attic vented? I use the 1-1000 rule, 1 square inch of vent for each 1000 btu's. 80,000 btu furnace 80 sq. inch vent-8"x10".

    Tom Rees / A Closer Look Home Inspection / Salt Lake City, Utah

  5. #5
    Join Date
    May 2010
    Location
    St. George, UT
    Posts
    217

    Default Re: Gas company red tags furnace

    Where I am, they require a dedicated vent for the gas furnace through the roof. I think this probably came about because the newer designs of homes lack proper ventilation (1sf/300sf of living space) The gas supplier wants to make sure the appliance works regardless of the amount of attic ventilation.


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