05:53AM | 10/23/09
Member Since: 10/22/09
3 lifetime posts
I would like to install a gas fireplace in my basement (which is completeley below grade). Is it possible to run a horizontal direct vent out through the concrete connect a 90' and come up above grade via a dugout well. Total distance below grade would be 1.5 feet.


01:49AM | 10/24/09
Member Since: 10/23/09
1 lifetime posts
Generally venting must be installed above grade. You should carefully read manufacturers instructions and check local codes. The venting is a key factor in the safe and proper operation of your fireplace.


04:49PM | 10/24/09
Member Since: 10/22/09
3 lifetime posts
Thanks for the reply Joe. I have contacted the manufacturer but their response is to have their local rep access the situation. I contacted the local rep and explained my dilemma but after saying they would show up they haven't.

Can you explain why I can vent vertically through the roof, going through 2 floors and an attic (approx distance 25 feet) but I can't vent horizontally out 5 feet and come up above grade


05:44PM | 10/26/09
Member Since: 10/25/09
2 lifetime posts
Use caution with propane in a basement. Propane (properly called LP gas, for "liquified petroleum" gas) appliances are generally prohibited in basements, or in a pit in crawl spaces. The reason is that LP gas is heavier than air, so if a leak develops, the gas will pool on the floor of the basement, and go undetected because the gas will not rise into the living space where the odor would be detected by the occupants. As the leak continues, more and more gas pools in the basement until any spark or ignition source lights the LP gas, and it's adios house. It will literally blow the house into millions of indistinquishable bits, and you will be on top of your neighbor's garage (if you survive). It's serious business.

The development of such a leak is rare, but a real possibility. Such a scenario has been reality many times, so don't think it' not possible.

Plumbing and fuel gas codes call for a floor drain in the basement (separate from a plumbing drain) that extends to exterior daylight. The idea is that the propane will sink down this drain and flow to the exterior where it will disipate.

This is not required for natural gas, because natural gas is lighter than air, and will rise from the basement through the house where it's odor will be detected by the occupants.


05:54PM | 10/26/09
Member Since: 10/25/09
2 lifetime posts
BTW, CSST gas tubing (the flexible tubing with the yellow jacket) can be damaged by lightning and cause a gas leak. This thin-wall tubing can short out against other metal (such a copper water pipe) when the house is struck by lightning, and the thin wall is burned through, leading to a leak of the gas. This is a relatively newly discovered phenomenon in houses with CSST installed. There is a relatively new requirement in codes that the gas piping must be grounded at it's entrance into the house, to prevent damage to the CSST tubing.


01:50AM | 11/01/09
Member Since: 10/22/09
3 lifetime posts
Thanks for the reply but this has nothing to do with the venting issue. I need to address that problem first before I move foward.


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