real fire smoke chimney

  1. J

    Smoke exiting gas fireplace from real fire in room below

    Hi There I've a small open fireplace in the cellar which has been NACS swept with a Colt cowl fitted but smoke exits from the living flame gas fireplace in the room above even though it has a separate flue. Any ideas or is it definitely a flue liner I need. I have a Co2 detector. My first...
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