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  1. #1
    Join Date
    Dec 2011
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    Toronto
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    Default Missing gas flue from the furnace

    Is this proper combustion air inlet ?

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    Last edited by Terry Choi; 06-04-2012 at 09:59 PM.
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  2. #2
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
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    2,478

    Default Re: Missing gas flue from the furnace

    Quote Originally Posted by Terry Choi View Post
    Hello brothers,

    Is this proper combustion air inlet ?
    "Brothers"?

    Terry,

    Depends on whether or not there is adequate combustion air provided to the room/closet which houses the furnace.

    Department of Redundancy Department
    http://www.FullCircleInspect.com/

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

    Default Re: Missing gas flue from the furnace

    Quote Originally Posted by Terry Choi View Post
    Is this proper combustion air inlet ?
    Yes it is.

    Eric Barker, ACI
    Lake Barrington, IL

  4. #4
    Join Date
    Jul 2008
    Location
    Snowbird (this means I'm retired and migrate between locations), FL/MI
    Posts
    4,086

    Default Re: Missing gas flue from the furnace

    Nope.BTW, see those rings?Combustion air Inlets protected from blockage/obstructions. This includes openiings in surfaces, ledges where idiots store junk.


  5. #5
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool Re: Missing gas flue from the furnace

    From the title, I'd say 'no'. The flue is the exhaust pipe. You are referring to the intake pipe or lacktherof. Generally not required by most mfrs. as long as you need the combustion air requirements but..............its still very stupid to do it this way for a number of reasons. First of all, you are depressurizing the CAZ, which in turn could backdraft an atmospherically vented appliance in the house. It could also cause infiltration of more cold air which makes the thermostat call for heat more often.

    Of course, an open top allows small items to fall into the combustion chamber. If the CAZ goes negative from other reasons such as leaky ducts, this provides a convenient route for CO spillage back into the room. At the very least, it should rise 2-3 feet to a broad radius elbow with an approved inlet screen.

    Best practices is always two pipe it from the outdoors. This may be an energy code issue in your area so check with your AHJ.

    Keep the fire in the fireplace.

  6. #6
    Join Date
    Jul 2008
    Location
    Snowbird (this means I'm retired and migrate between locations), FL/MI
    Posts
    4,086

    Default Re: Missing gas flue from the furnace

    Quote Originally Posted by Bob Harper View Post
    From the title, I'd say 'no'. The flue is the exhaust pipe. You are referring to the intake pipe or lacktherof. Generally not required by most mfrs. as long as you need the combustion air requirements but..............its still very stupid to do it this way for a number of reasons. First of all, you are depressurizing the CAZ, which in turn could backdraft an atmospherically vented appliance in the house. It could also cause infiltration of more cold air which makes the thermostat call for heat more often.

    Of course, an open top allows small items to fall into the combustion chamber. If the CAZ goes negative from other reasons such as leaky ducts, this provides a convenient route for CO spillage back into the room. At the very least, it should rise 2-3 feet to a broad radius elbow with an approved inlet screen.

    Best practices is always two pipe it from the outdoors. This may be an energy code issue in your area so check with your AHJ.
    Well stated and thoughtfully explained Bob H.

    I would further add that taking the combustion air from a space subject to indoor pollutants further risks HE deterioration.


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