Fresh Air Duct Work For Oil Furnace

 
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Old 12-06-2010, 07:33 PM   #1
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Fresh Air Duct Work For Oil Furnace


I've only seen this on the oil furnace in my home. I have a Bryant forced air oil furnace (beckett burner). First, the exhaust ducting exiting top center has a damper on it before exiting the home but it is inside a sheet metal box that has a fresh air supply from duct work leading outside. ALSO, the right side of the furnace housing has duct work attached to supply fresh air to the burner/pump area right behind the front removable cover of the furnace. When the furnace isn't running, cold air pours in from the fresh air ducting on the right side of the furnace which chills the basement and you can actually fell the cold air coming through the supply vents when the furnace isn't running. Do I need all this fresh air supply crap? I haven't seen this on any other furnace on any of my jobs. Thanks.
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Old 12-06-2010, 09:09 PM   #2
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Re: Fresh Air Duct Work For Oil Furnace


Sounds like a direct vent oil furnace, so without seeing it, I would wager that intake duct likely has to stay.
But, since the burner gets its combustion air from outside, maybe you could try to enclose the equipment by building a small insulated utility room around it. That might help keep the rest of the basement from getting cold anyway. Just be sure to leave enough room to clean and service the equipment.

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Old 12-06-2010, 10:37 PM   #3
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Re: Fresh Air Duct Work For Oil Furnace


The exhaust is 6" round metal ducting directly from the combustion chamber to the chimney. It first goes through the sheet metal box which contains the damper door and a fresh air duct (same size). The other is also 6" metal ducting attached to the side of the furnace housing and it leads directory outside. Some major cold air comes in the 6" duct attached to the side. It just looks odd......really odd.
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Old 12-07-2010, 04:26 AM   #4
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Re: Fresh Air Duct Work For Oil Furnace


Post pics of this set up.
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Old 12-07-2010, 06:38 AM   #5
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Re: Fresh Air Duct Work For Oil Furnace


I was thinking that would be the best way to show everyone my setup. I'm working on the pics now.
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Old 12-07-2010, 07:10 AM   #6
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Re: Fresh Air Duct Work For Oil Furnace


Yes, post a pic.
Most oil direct vent [ODV] equipment doesn’t use PVC, they use metal duct, but anyway, you said in your second post that the pipe goes into the "chimney". If you have a chimney, I don’t know why you would have a direct vent system with a fresh air intake.
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Old 12-07-2010, 07:19 AM   #7
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Re: Fresh Air Duct Work For Oil Furnace


My thoughts exactly. Pics coming shortly. Thanks.
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Old 12-07-2010, 08:00 AM   #8
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Re: Fresh Air Duct Work For Oil Furnace


Ok, it is a Bryant model# 369AAN Multi-Poise furnace. The picture in their brochure shows one round metal duct venting the exhaust straight up......thats it. No fresh air ducts anywhere.
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Old 12-07-2010, 08:06 AM   #9
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Re: Fresh Air Duct Work For Oil Furnace


Fresh air duct work for oil furnace-2010-12-07-08.39.48.jpg

Fresh air duct work for oil furnace-2010-12-07-08.40.10.jpg

Fresh air duct work for oil furnace-2010-12-07-08.38.48.jpg

Fresh air duct work for oil furnace-2010-12-07-08.39.10.jpg
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Old 12-07-2010, 08:10 AM   #10
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Re: Fresh Air Duct Work For Oil Furnace


The duct in the TOP of the "damper box" is a fresh air lead from outside. The horizontal duct exiting the left of the box goes directly into the chimney. The right side duct is a fresh air supply connected to the same box outside as the other fresh air duct. Pic to follow.
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Old 12-07-2010, 08:13 AM   #11
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Re: Fresh Air Duct Work For Oil Furnace


Fresh air duct work for oil furnace-2010-12-07-08.36.37.jpg

Fresh air duct work for oil furnace-2010-12-07-08.36.55.jpg
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Old 12-07-2010, 08:23 AM   #12
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Re: Fresh Air Duct Work For Oil Furnace


Fresh air duct work for oil furnace-2010-12-07-09.18.20.jpg

Fresh air duct work for oil furnace-2010-12-07-09.18.46.jpg
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Old 12-07-2010, 09:20 AM   #13
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Re: Fresh Air Duct Work For Oil Furnace


It looks like when the furnace was spec’d by the installer, they must have decided that the building envelope was tight and they needed to use the outside combustion air setup. Doesn’t this vent setup indirectly provide makeup air for the plenum as well?
I wouldn’t just start modifying any ducts without having somebody qualified out there to look things over first.
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Old 12-07-2010, 09:44 AM   #14
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Re: Fresh Air Duct Work For Oil Furnace


They just reattached what was there feom the old furnace. The old furnace always had a soot smell which ended up being a crack in the exchanger. Maybe thats why there was a carbon monoxide detector in the basement when I bought the house. The basement is not tight by any means.......definitely drafty.
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Old 12-07-2010, 05:27 PM   #15
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Re: Fresh Air Duct Work For Oil Furnace


Its a combustion air intake.

If your basement is not tight. then closing off the combustion air intake is ok.

Looks like someone had plans to finish the basement. And they set it up for a tight basement in the future.

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