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  #1  
Old 8/25/10, 8:00 PM
David C. Macy's Avatar
David C. Macy David C. Macy is offline
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Default Fogged Glass/Gas Fireplace

New construction

73 degrees in house with air conditioner running.

Factory built fireplace vented to exterior through side wall.
Gas operated by a wall switch.

Glass fogged over when testing. Is this normal?

Thanks!!
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  #2  
Old 8/25/10, 8:02 PM
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Michael Larson Michael Larson is offline
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Default Re: Fogged Glass/Gas Fireplace

Quote:
Originally Posted by dmacy View Post
New construction

73 degrees in house with air conditioner running.

Factory built fireplace vented to exterior through side wall.
Gas operated by a wall switch.

Glass fogged over when testing. Is this normal?

Thanks!!
Yes,

It should clear after a few minutes of operation.

There is a lot of water vapor when you burn gas.



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  #3  
Old 8/25/10, 8:09 PM
David C. Macy's Avatar
David C. Macy David C. Macy is offline
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Default Re: Fogged Glass/Gas Fireplace

Thanks!!
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  #4  
Old 8/26/10, 12:38 AM
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Russel Ray Russel Ray is offline
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Default Re: Fogged Glass/Gas Fireplace

Yes, but that fog also has a small amout of sulfuric acid in it, so after many years the glass can be etched so badly that you have to replace the glass if you want to see the fire in the fireplace.



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  #5  
Old 8/26/10, 4:17 PM
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William Warner William Warner is offline
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Default Re: Fogged Glass/Gas Fireplace

Flue gas emissions from 'fossil' fuel combustion
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  #6  
Old 8/27/10, 12:51 PM
John Safstrom John Safstrom is offline
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Default Re: Fogged Glass/Gas Fireplace

Saw the same thing yesterday on an inspection. It cleared in a minute. You can see the fog lift from the bottom when it heats up.
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  #7  
Old 1/26/11, 9:34 AM
Robert Manley Robert Manley is offline
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Default Re: Fogged Glass/Gas Fireplace

Yes, But I have seen many of these that do not clear up after several minutes even as long as 15-20. I also have noted and spoke to a fireplace technician that some of the double pane glass gas fireplaces have seals(?) between the panes and that if the seal is bad, you can get fogging and condensation between the two panes. Thought is made sense since I have seen what appears to be air movement and haze fogging around the corner after running the fireplace for a long time. Evidently the warmer air hitting the colder air of the outer pane. Ever heard of this? Was not sure!




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  #8  
Old 1/26/11, 9:37 AM
Robert Manley Robert Manley is offline
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Default Re: Fogged Glass/Gas Fireplace

So, My question is what is the problem if the fireplace continues to show fog that does not clear. And is it possible to be in between the two panes of glass?




Robert Manley
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  #9  
Old 2/3/11, 2:14 PM
Joe Hugenroth Joe Hugenroth is offline
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Default Re: Fogged Glass/Gas Fireplace

Quote:
Originally Posted by rmanley View Post
So, My question is what is the problem if the fireplace continues to show fog that does not clear. And is it possible to be in between the two panes of glass?
No problem really, as it does not affect the fireplace operation. It's more of a cosmetic issue. I point it out to customers, and let them know the glass can be replaced if they want.
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