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  1. #1
    Join Date
    Mar 2007
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    Washington State
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    579

    Default Gas Furnace combustion air intake

    This 90+ gas furnace is using combustion air from the garage and is located near the water heater flue pipe. My concern is the potential for the air intake to draw in flue gases from water heater.

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  2. #2
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
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    5,847

    Default Re: Gas Furnace combustion air intake

    Quote Originally Posted by Trent Tarter View Post
    This 90+ gas furnace is using combustion air from the garage and is located near the water heater flue pipe. My concern is the potential for the air intake to draw in flue gases from water heater.
    And if that did happen what would be the problem?

    The Cat IV furnace intake is for combustion air and not for air that will be introduced into the living space of the home.

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
    Join Date
    Mar 2007
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    Washington State
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    Default Re: Gas Furnace combustion air intake

    Thanks Scott, I just don't see it done like this very often.


  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,252

    Default Re: Gas Furnace combustion air intake

    That's not a proper way to support the thermal expansion tank, but I'm sure you wrote that up already.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
    Posts
    1,363

    Default Re: Gas Furnace combustion air intake

    If the furnace is pulling in combustion gases from the water heater then I'd be looking at the W.H. for drafting concerns. Also, combustion gases are very corrosive and wreak havoc on heat exchangers.

    Eric Barker, ACI
    Lake Barrington, IL

  6. #6
    Rick Hill's Avatar
    Rick Hill Guest

    Default Re: Gas Furnace combustion air intake

    I would check that combustion air to garage space is OK for combined BTU's of furnace and H2O heater. By volume it would require a rather large garage to meet the combustion air requirement.


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