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Old 12-21-2008, 10:35 AM   #1
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Fireplace insert flue closure air-tightness


I have a fireplace insert (NG), the insert is sealed and has a separate cold air intake and exhaust line. It was installed summer 2007. The contractor said that they used rockwool in the flue/damper. I was checking the house for airleaks and i noticed that air is moving into the fireplace. Is this a safety issue or did the contractor not fully seal the flue/damper? If not, can I or should I install more rockwool?

Thanks in advance,
Mike

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Old 12-21-2008, 11:17 AM   #2
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Fireplace insert flue closure air-tightness


The rockwool may be used to fill the gap around the liner and has nothing to do with draft. In really cold weather those chimneys can ice up so I recommend my customers run them once a day. It can get a downdraft due to the chimney getting cold and losing any natural updraft. Try run it and keep the chimney warm or you may develop pilot outage problems.

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Old 12-21-2008, 11:29 AM   #3
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Fireplace insert flue closure air-tightness


The combustion box is completely sealed unit. I seem to have a natural updraft from the room. The top of the chimney has a cap for the intake and exhaust. It seems the contractor failed to secure the cap, my guess. Should i be expecting the updraft? I have a Kozy Heat Jackson XL.

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Old 12-21-2008, 11:44 AM   #4
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Fireplace insert flue closure air-tightness


Hot air rises, so if the cap is not sealed properly then you will get an updraft/leak. Call him back and be nice about it or he may get cranky and not do a good job.
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Old 12-21-2008, 03:32 PM   #5
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Fireplace insert flue closure air-tightness


Quote:
Originally Posted by yuri View Post
Hot air rises, so if the cap is not sealed properly then you will get an updraft/leak. Call him back and be nice about it or he may get cranky and not do a good job.
Sounds like he already didn't do the best job.
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Old 12-21-2008, 05:20 PM   #6
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Fireplace insert flue closure air-tightness


I don't do good work for people who yell at me. If they are reasonable, yes. Mistakes do happen.
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Old 12-21-2008, 06:11 PM   #7
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Fireplace insert flue closure air-tightness


I still do good work.

It just takes a bit longer.

And there is absolutely no price break on anything.
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Old 12-21-2008, 06:19 PM   #8
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Fireplace insert flue closure air-tightness


Amen.

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