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Old 09-27-2009, 07:39 PM
 
Location: NJ
1,589 posts, read 3,526,986 times
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Default Gas fireplace - open or close flue?

We moved into a house that has a gas fireplace. I never used one before so I was wondering if the flue for the chimney is supposed to be open or closed when the fire is lit? The fireplace uses fake logs, not actual wood. Should the glass doors be left open or closed?
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Old 09-27-2009, 07:45 PM
 
Location: West Michigan
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Glass doors should be closed, as for the flue, it would depend if it were a vented or ventless gas fireplace.
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Old 09-27-2009, 07:55 PM
 
Location: NJ
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Quote:
Originally Posted by Bydand View Post
Glass doors should be closed, as for the flue, it would depend if it were a vented or ventless gas fireplace.
How do you tell if it is vented or ventless?
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Old 09-27-2009, 08:04 PM
 
Location: Ridgewood
299 posts, read 976,341 times
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Is this a gas log set installed in a masonry firepalce or is it a prefabricated fireplace.
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Old 09-27-2009, 10:38 PM
 
Location: SE Michigan
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I think if it is vented, you would see a little box on the outside of your house where the fireplace is. That is how the fumes are vented to the outdoors.

If there is no box, then I think that means it is ventless design fireplace.
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Old 09-28-2009, 07:21 AM
 
Location: Chapel Hill, NC
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My gas log set came with a little clamp to screw onto the edge of the damper to hold it open about an inch all the time.
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Old 09-28-2009, 01:07 PM
 
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If you have vented gas logs then you must keep the flue open when the logs are burning. Most vented sets have a built in "stop" for the flue to prevent someone from closing it completely.
If the log set gives off a nice yellow flame then its likely vented.

Frank
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Old 01-27-2013, 09:08 AM
 
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Thank you for all your helpful comments but I am a little confused. I have a gas fireplace. The kind where you turn on the gas, then light it. It has artificial logs and is in a masonry (not pre-fab) fireplace with no glass front or vents. Do I need to have the flue open when using it?
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Old 01-27-2013, 09:34 AM
 
Location: Knoxville
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Yes!!!!!
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Old 01-27-2013, 10:59 AM
 
Location: East of Seattle, originally from SF Bay Area
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If you want to live another day, open it. Otherwise the carbon monoxide will get you. It sounds like you have a wood-burning fireplace that was converted to gas. You can close the flue when you shut it off, to keep the warm house air from going up the chimney, or if you have glass doors just leave the flue open all the time and close the doors when off. You can have the doors open or closed when it's burning, open lets more heat into the room bust is more dangerous for small children.
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