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Old 02-06-2017, 05:54 PM   #1
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Combine Sewer and Gas Furnace Vent


I have the main septic line going up through the middle of my house. In the attic I would like to put a small gas heater but I will need to vent the gas out. Can I branch into the septic line for ventilation? It will only venting out about 3 feet from top since its already in the attic.
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Old 02-06-2017, 06:33 PM   #2
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Re: Combine Sewer and Gas Furnace Vent


BOOM!
Bad combo. Sewer gas and flame from heater.

RR
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Old 02-06-2017, 07:01 PM   #3
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Re: Combine Sewer and Gas Furnace Vent


vent free it is then. Honestly I thought it may cause issues but doesn't hurt to ask the pro's
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Old 02-06-2017, 07:14 PM   #4
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Re: Combine Sewer and Gas Furnace Vent


Vent free gas heaters come with a slew of problems. Do some research.
I would would run a new vent.
http://www.greenbuildingadvisor.com/...ed-gas-heaters
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Old 02-06-2017, 07:23 PM   #5
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Re: Combine Sewer and Gas Furnace Vent


I'm a little curious why you want to put a heater in an attic space. Since a true attic space is unconditioned, if it is cold enough to warrant a heater you will burn a lot of gas. There also might be code issues, given that attics usually have exposed framing, insulation, etc.
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Old 02-06-2017, 10:07 PM   #6
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Re: Combine Sewer and Gas Furnace Vent


Not to mention what water condensate will do the the roof.
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Old 02-06-2017, 10:14 PM   #7
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Re: Combine Sewer and Gas Furnace Vent


its a very large house and the 3rd floor has been conditioned as a living space with a crawlspace attic above, new finished drywall. Small Ceiling though, about 6.5ft height.
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Old 02-07-2017, 11:22 AM   #8
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Re: Combine Sewer and Gas Furnace Vent


Anyway to bring in some heat from your central system?
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Old 02-07-2017, 11:59 AM   #9
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Re: Combine Sewer and Gas Furnace Vent


Quote:
Originally Posted by Yodaman View Post
Anyway to bring in some heat from your central system?
If it's a attic retrofit reno, AC won't be even close to be enough. Heat might just work if it was oversized to begin with.

Ductless heat pump might be a great idea for this space.

Ventless heaters are illegal around here. I don't recommend them.

Cheers!
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Old 02-07-2017, 12:00 PM   #10
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Re: Combine Sewer and Gas Furnace Vent


unfortunately no, they did not run any duct work up to the attic so its easier to run it separately.
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Old 02-07-2017, 12:01 PM   #11
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Re: Combine Sewer and Gas Furnace Vent


A small electric heater is what I would consider rather than a small gas heater.
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Old 02-07-2017, 01:30 PM   #12
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Re: Combine Sewer and Gas Furnace Vent


Besides all of the seafet concerns a ventless gas heater will produce a ton of moisture, exactly what you don't want up there, besides CO.

I don't know your climate zone but suspect you are way short on insulation, R-49 is common for ceilings in cold country. Check your local code requirements for heat, electrical, insulation, as that space sounds like it needs to meet living space requirements and related permits.

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Old 02-07-2017, 01:47 PM   #13
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Re: Combine Sewer and Gas Furnace Vent


Bud, I actually am getting a professional to come in and re-insulate the attic after closing it off. Dr Energy Saver is the company and they seem to really know what they are talking about. They would be using air sealing the attic and putting in highly compressed blown in insulation. Gas is a lot cheaper around here vs electric. As far as the area goes I am near Pittsburgh, PA.
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Old 02-07-2017, 01:51 PM   #14
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Re: Combine Sewer and Gas Furnace Vent


attached are pictures of the attic when we bought it, framing is the same but above the ceiling is a crawlspace now to access the top of the roof.
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Combine Sewer and Gas Furnace Vent-house-004.jpg   Combine Sewer and Gas Furnace Vent-house-005.jpg  
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Old 02-07-2017, 02:11 PM   #15
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Re: Combine Sewer and Gas Furnace Vent


Nice big space. Unfortunately it is likely your code department and any future buyers will consider that as living space and want to see all permits and that would probably include provisions for heating. I don't see any receptacles on the walls for starters. I don't know whether you bought it like that or added the drywall yourself, but the sooner you pull permits the better. Everything goes on a computer today and easy for all to check to be sure it was inspected.

Note, insulating those slopes is a pain and often requires building them out for greater depth.

Bud
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