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Old 10-08-2008, 12:01 PM   #1
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


I just recently had my gas furnace replaced. I called in a professional to diagnose why we could smell gas at times, especially when the heat started up.

The diagnosis was that we needed a new furnace due to a rusted out hole in the metal cabinet near the condesate drain. The professional informed that this was source of not only CO and gas into the crawl space but allowed CO to be pulled into the burner (flame) area reducing effeicency to dangerous levels. (This is vented with PVC pipe only)

Here are a couple of photos from the old extracted unit. To me this looks like a closed air circulation system within the cabinet. Can someone explain to me how the cabinet hole was causing this problem?

I have attached a photo. Top side in this photo was actually bottom side when installed. Small lines appear to be condesate lines directed toward vent point. Large pipe end at rust whole appears to be a non-capped branch of exhaust. Other end went to the PVC pipe vent. This is a Lennox GHR26 series furnace.

Just courious, thank you.
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.-furnace-004.jpg   How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.-furnace-001.jpg   How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.-furnace-002.jpg   How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.-furnace-003.jpg  


Last edited by Chris H; 10-08-2008 at 12:20 PM.
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Old 10-08-2008, 12:56 PM   #2
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


The condensate is very toxic and can eat away metal as in your pictures. My guess is that there was a leak in the condensate system and over the years did the damage that you see.

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Old 10-08-2008, 05:33 PM   #3
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


Was there two PVC pipes, one for the vent the other for combustion air both going to the outdoors?
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Old 10-08-2008, 05:55 PM   #4
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


The professional informed that this was source of not only CO and gas into the crawl space but allowed CO to be pulled into the burner (flame) area reducing effeicency to dangerous levels. (This is vented with PVC pipe only) ....."You can't smell CO !"
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Old 10-08-2008, 06:01 PM   #5
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


Those holes dont appear to be anywhere near the heat exchanger, and if the combustion air inlet was piped to the outdoors...hmm.

It looks like the condensate was leaking and rotted a hole in the cabinet, but the cabinet isnt part of the sealed system, at least not where its rotted.

Last edited by 8 Ball; 10-08-2008 at 06:04 PM.
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Old 10-08-2008, 06:20 PM   #6
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How does hole in Gas Furnace cabinet contribute to carbon monoxide in crawl space.


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Originally Posted by 8 Ball View Post
Those holes dont appear to be anywhere near the heat exchanger, and if the combustion air inlet was piped to the outdoors...hmm.

It looks like the condensate was leaking and rotted a hole in the cabinet, but the cabinet isnt part of the sealed system, at least not where its rotted.
I agree 100% They nay have had a gas leak that they smelt when it started.

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