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  1. #1
    Join Date
    Mar 2007
    Location
    Daniel Island, SC.
    Posts
    230

    Default Clip on fireplace damper

    All gas log manufacturers require a clip on the damper to prevent CO2 flumes from entering the house when the pilot goes out if you have gas logs. If the damper is at the top of the flue and is opened and closed by a chain, does it require a clip?

    Jim

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  2. #2
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: Clip on fireplace damper

    The damper is required to be blocked open. There is no CO danger if the pilot goes out though, the danger is when the fireplace is in use with the damper closed.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
    Join Date
    Mar 2007
    Location
    Daniel Island, SC.
    Posts
    230

    Default Re: Clip on fireplace damper

    Thanks Jim,

    I was under the impression also that if the damper was closed C02 gas could enter the living space and be fatal if the pilot were to go out and gas was dispelled.

    Jim


  4. #4
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: Clip on fireplace damper

    If the pilot goes out due to lack of oxygen because of CO displacement... I think life would have been over for the occupants already.

    The pilot light is kind of a red herring in the scenario.
    The main issue is CO building up because of the closed damper.

    As I tell my clients, there is no visual signal that you forgot to open the damper with gas logs as there would be with a wood fire.
    You go to sleep with the gas logs going and just don't wake up

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  5. #5

    Default Re: Clip on fireplace damper

    Jim,
    CO2 is Carbon Dioxide.
    CO is carbon monoxide, and is the concern here.

    The 2 reasons for a damper clamp/stop are to allow gas leakage to escape out the flue, and to prevent CO from entering the home while the fireplace is fired.

    If the pilot goes out, then the pilot safety (thermocouple/ electromagnet) should engage and prevent gas from flowing.


  6. #6
    Join Date
    Jun 2010
    Location
    San Luis Obispo
    Posts
    26

    Default Re: Clip on fireplace damper

    Quote Originally Posted by JIM MURPHY View Post
    If the damper is at the top of the flue and is opened and closed by a chain, does it require a clip?

    Jim
    Yes.

    Also the pilots are a herring as plenty of gas log sets have no pilot or safety valve, open valve, apply match to burner.


  7. #7
    Join Date
    Aug 2011
    Location
    Bennett (Denver metro), Colorado
    Posts
    1,394

    Default Re: Clip on fireplace damper

    No need to over think this one........gas logs.......then damper must be locked in open position or removed........simple as that.

    If you choose not to decide, you still have made a choice.

  8. #8
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
    Posts
    1,363

    Default Re: Clip on fireplace damper

    Whether or not a lock is present on the damper is not an issue with me. There doesn't seem to be much concern for standing pilots on a range or for the lack of a requirement that an exhausting hood be present. With all the air exchanges in a home, even a tightly constructed one I don't see where one little pilot flame is going to much of an issue. Obviously I'm not always railroaded into the thinking of others.

    Eric Barker, ACI
    Lake Barrington, IL

  9. #9
    Join Date
    Mar 2007
    Location
    Knoxville, TN
    Posts
    2,446

    Default Re: Clip on fireplace damper

    I call it out when its missing.


  10. #10
    Join Date
    Sep 2010
    Location
    NY Finger Lakes Area
    Posts
    206

    Default Re: Clip on fireplace damper

    .....I don't think the issue is the standing pilot. The reason for clipped damper is so the log-set is not operated with the damper in the closed position. Unlike vent-free equipment, many log sets don't have oxygen depletion sensors and must be operated with damper open........Greg.


  11. #11
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Default Re: Clip on fireplace damper

    The position of the clamp on the damper is based upon the mfrs. listed instructions and the input BTU rating. Some local jurisdictions exceed this requirement such as the State of Mass, where dampers are required to be completely removed or welded wide open. Know that if the logset is controlled by a remote control, nobody is going to get up and open the damper before turning them on. All log mfrs. will tell you to open the damper wide open (just as with burning wood) before operating the burner. The language refers to the "minimum permanent net free opening". When you place the clamp on the edge of a throat damper valve plate, the MPNFO may be 10-20 inches if you're lucky. Most start at 50"sq., which is the equivalent of an 8" round pipe.

    I hear you Eric but if a new owner operates logs with the damper closed, it can result in fire, CO exposure or soot particulate soiling of the house.

    I put the clamps on the damper handle in the wide open position because so many people operate logs without thinking to open the damper. They can install glass doors to minimize air infiltration.

    Keep the fire in the fireplace.

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