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Structural Inspections Contains discussions about the structural portion of a home inspection. This includes foundations, framing, etc.

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Old 1/7/06, 12:30 AM
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Joe Funderburk, CMI Joe Funderburk, CMI is offline
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Default Strange Duct in Crawl Space

Anyone know what the purpose of this is? From inside the crawl space, I found this duct attached to a flex duct that goes up through the floor. The duct has a wire screen in it to keep out rodents.

Here's my guess. The structure was a double-wide mobile home. It had a pre-fab metal fireplace with metal chimney. The duct was under the area of the fireplace. I think it is to provide combustion air to a tightly built structure. Do you agree?

If that's what it is, when the HVAC is on, will it not suck in air from the crawl space???

strange-duct-crawl-space-010606-042.jpg

strange-duct-crawl-space-010606-043.jpg



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  #2  
Old 1/7/06, 12:40 AM
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jmichalski jmichalski is offline
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Default Re: Strange Duct in Crawl Space

Any more info available on what is directly over this duct?
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Old 1/7/06, 1:00 AM
NWJon NWJon is offline
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Default Re: Strange Duct in Crawl Space

Quote:
Originally Posted by jfunderburk
Anyone know what the purpose of this is? From inside the crawl space, I found this duct attached to a flex duct that goes up through the floor. The duct has a wire screen in it to keep out rodents.

Here's my guess. The structure was a double-wide mobile home. It had a pre-fab metal fireplace with metal chimney. The duct was under the area of the fireplace. I think it is to provide combustion air to a tightly built structure. Do you agree?

If that's what it is, when the HVAC is on, will it not suck in air from the crawl space???
If it is to the fireplace it would most likely be the "outside" combustion air intake.... and no... when the HVAC kicks on.. it shouldn't suck air in.. at least not in any different manner than any other pre-fab fireplace with outside air intake ducting.

Cheers, Jon
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Old 1/11/06, 1:02 AM
lwillick lwillick is offline
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Default Re: Strange Duct in Crawl Space

It could also be sending heat into a crawl space. This is quite common here where it is so cold. And this type of duct is connected to the furnace duct heat out put vents.

Hope this helps.
Regards,
larry
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