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What is this?

2K views 13 replies 7 participants last post by  rncopper 
#1 ·
I am remodeling a bathroom and when I knocked out one wall, this heater duct was going up to the roof.

I have no heating vents above the floor, the duct is 1'x3". My question is: what is this? Is it an exhaust/vent for the gas furnance? If so, why is it so big? What clearance does it need around it?

I never knew it was there until I tore down the wall. I don't plan on doing anything with it; just want to know what it is.

Thanks!!
 

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#2 ·
Hard to tell from the picture but it could be an oval vent for the furnace. Does it go out of the roof? 1 x 3 seems small for a vent. See where it goes under the floor.

If it is your furnace vent, 1" clearance for double wall and 6" clearance for single wall from combustables.
 
#5 ·
I just went and looked at where it came "from". It comes from a round "smokestack-like " ductwork from the furnance. The round portion as it rises then changes to the 12"x3" metal ductwork.

I can try and go into the attic, but that will be a chore. I have 10 ft ceilings!! <grin>

The heater has been here for years (at least 10 that I know of) and I have it serviced every year by the gas company. So, I don't think it would end in the attic. And it doesn't feel "warm" when the heat turns on, so I don't think it is run into the "attic" for heat.
 
#6 ·
what or where is the wall this is in? from the pic it looks like this is at the end of a hallway. If that duct is inside a wall and its 12" wide, that's a loooong way inbetween studs on either side of it. I ask because my original duct work was sheet metal between studs and ran floor to ceiling... but there were studs.
 
#8 ·
Funny you should ask, because I looked at it yesterday. Here is a pic. The part that is coming out of the heater itself (round metal portion) is the thing that then continues up thru the wall and changes into a 12inx3in oval shaped metal type tubing.

As you can see, the hot water heater is also attached to it, so I was assuming it must be some type of "vent". Am I correct?

And again, what type of clearance will I need when I re-framing the "vent" in the first picture?
 

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#10 ·
I was looking on the outside of the house from far away and I could see a "vent" type pipe coming out of the roof, so I am sure that is where it goes. Since I have never done anything with it and the house has been inspected several times in the last 10 years (once when I bought it and twice before that), I am sure it is ok.

Do you know how much clearance I will need on the side of the pipe that goes thru the wall when I frame it? It will be in a wall that has the bathroom on one side and the original wall of the original house (1902 built) on the other side.
 
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