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  1. #1
    Join Date
    Mar 2007
    Location
    Daniel Island, SC.
    Posts
    235

    Default Gas fireplace wall exhaust clearance

    Please look at the picture and let me know if the exterior gas fireplace wall exhaust is too close to door openings, one on each side. This is also under a 2nd level balcony/deck.

    Thanks,

    Jim



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  2. #2
    Join Date
    Apr 2011
    Location
    Bozeman, Montana
    Posts
    94

    Default Re: Gas fireplace wall exhaust clearance

    Jim,
    Excerpt from an article at inspectopedia;
    Clearance Distances for the Exterior Vent Termination of a Direct-Vent Gas Fireplace / Heater


    [Click to enlarge any image]
    The clearance distancess shown above and at the top of this page are between the vent termination cap of a gas fireplace and the air inlet side of an A/C or heat pump compressor/condenser. At CLEARANCE DISTANCE, HVAC a reader commented that his building inspector did not accept the safety of this installation. We agreed.
    Reviewing manufacturer's installation instructions for a typical gas fireplace direct-vent exhaust termination cover or cap we find that the clearance distances to other building features or mechanical systems are similar but not necessarily identical to the Direct Vent Gas Appliance clearances given in the preceding table. This may be because that a typical gas fireplace heater does not use a power-exhaust vent or also because of different BTUH ranges.
    Minimum Clearance Distance Requirements for the Exterior Vent Termination of a Gas Fireplace Heater8
    Direct vent gas fireplace exhaust termination item clearance distance Distance required (Canada)1 Distance required (USA)2
    Clearance distance from gas vent termination cap to adjacent building 48" 8
    Clearance distance to vinyl surfaces such as vinyl siding or vinyl trim 12" 8
    Clearance above grade, veranda, porch, deck, or balcony 12" (30 cm) 12" (30 cm)
    Clearance to window or door that may be opened 12" (30 cm) 9" (23 cm)8
    Clearance to permanently closed window [Note 5] [Note 5]
    Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet (61cm)
    from the center line of the terminal (check with the local code)
    18" (46cm) 18" (46cm)
    Clearance to unventilated soffit 15" (38cm) 15" (38cm)
    Clearance to outside corner: with approved Termination Caps 12" (30cm) 12" (30cm)
    Clearance to outside corner: with Manufacturer's Special Termination Cap 6 6" (15cm)6 1-6" (15cm)6, 8
    Clearance to inside corner: with approved Termination Caps 12" (30cm) 12" (30cm)
    Clearance to inside corner: with Manufacturer's Special Termination Cap 6 6" (15cm)6, 8 1-6" (15cm)6, 8
    Clearance to each side of center line extended above [the gas] meter/regulator assembly 36" (90cm)5a [Note 5]
    Clearance to [the gas] service regulator vent outlet 36 "(90cm) [Note 5]
    Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance 12" (30cm) 9" (23 cm)
    Clearance to a mechanical air supply inlet
    3' (91cm) above if within 10' (3m) horizontally
    72" (1.8m) 36" (90cm)5b
    Clearance above paved sidewalk or a paved driveway located on public property 84" (2.1m)3 [Note 5]
    Clearance under balcony, porch, or veranda 12"(30cm)4 [Note 5]
    OpinionsOn Additional Recommended Cleareance Distances from a Direct Vent Gas Fireplace Exhaust Opening to other Building Features or Equipment
    Distance to an air conditioner or heat pump compressor/condenser unit to the nearest point of a direct vent gas heater or gas fireplace exhaust 24 inches to 6 feet [Note 6]
    Notes from the original source cited below:
    1. CSA B149.1, Natural Gas and Propane Installation Code
    2. ANSI Z223.1/NFPA 54, National Fuel Gas Code
    3. A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings.
    4. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
    5. Clearance in accordance with local installation codes and the requirements of the gas supplier
    5.a 3 feet (91cm) within a height of 15 feet (4.5m) above the meter / regulator assembly
    5.b 3 feet (91cm) above - if within 10 feet (3m) horizontally
    Additional Notes:
    6. This is the author's OPINION considering that heat from the gas exhaust vent blowing onto an A/C compressor unit condensing coil could imact the coil's ability to condense refrigerant back to liquid form, affecting the condenser unit's efficiency and life. I'm considering the situation in which the hot gas exhaust blows onto the air intake side of a condensing coil. (Most modern condenser units draw cooling air in from the unit sides and push it out the unit's top). Also see CLEARANCE DISTANCE, HVAC
    7. This is a Regency Fireplace Producucts termination cap; other manufacturers may have similar options. See the additional sources below.
    8. Watch out: check with the manufacturer of your heater and venting system for specific venting instructions and clearances to combustibles or to other features as these distances may vary from one appliance and manufacturer to another. For example the Travis Industries direct vent clearances include some distances that are different from the tables given above.

    DuraVent (and other manufacturers) warn that if a gas appliance, fireplace heater or other heater is not properly installed the system may be unsafe.
    A major cause of vent related fires is failure to maintain clearances (air spaces) to combustible materials. It is of utmost importance that double wall direct vent pro be installed only in accordance with these [the manufacturer's] instructions.
    Additional sources of direct vent gas fireplace clearance information:


    Mark


  3. #3
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,372

    Default Re: Gas fireplace wall exhaust clearance

    Get the make/model off the listed fireplace's data plate (or label), and look up the manufacturer's requirements for proper vent terminal clearances.

    Dom.


  4. #4
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    163

    Default Re: Gas fireplace wall exhaust clearance

    Jim,
    Go to page 22 of this manual. Maybe this will help.

    https://aplusair.ca/wp-content/uploa...all-Manual.pdf


  5. #5
    Join Date
    Mar 2007
    Location
    Daniel Island, SC.
    Posts
    235

    Default Re: Gas fireplace wall exhaust clearance

    Quote Originally Posted by Gary Burnett View Post
    Jim,
    Go to page 22 of this manual. Maybe this will help.

    https://aplusair.ca/wp-content/uploa...all-Manual.pdf

    Thanks, it did!


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