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Old 08-26-2011, 02:26 AM   #1
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gas furnace flue clearance


I'm installing a furnace and it was placed so the flue went thru a load bearing wall. It chard (sp?) the wood near the flue. I moved it so that it doesn't go thru the wall but I want it as close to the wall as I can get.

This is a nat-gas wall furnace and has an oval flue, and I haven't seen any flexable flues.

Is there something I can put between the flue and the wood to prevent fire?

I was thinking about several sheets of galv steel plates with washers in between to create air space.

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Old 08-26-2011, 04:35 AM   #2
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gas furnace flue clearance


Look at the install manual for its required clearances.

You would need atleast a 1" clearance rom the wood using sheet metal.

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Old 08-26-2011, 06:05 AM   #3
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gas furnace flue clearance


You should check what type of vent pipe you have going through the wall to the roof. Is it B vent which is double wall ?
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Old 08-26-2011, 03:19 PM   #4
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gas furnace flue clearance


Quote:
Originally Posted by COLDIRON View Post
You should check what type of vent pipe you have going through the wall to the roof. Is it B vent which is double wall ?
It is double wall and mentions 1" or 4F29 Firestop spacer. I googled 4F29 firestop and got nothing related.
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Old 08-26-2011, 04:56 PM   #5
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gas furnace flue clearance


Yes with class B vent you should have one inch clearance around the entire pipe. You should be able to purchase class B spacer bases which are square with the inside round like the diameter of the pipe, you nail the spacers to the wall or chase then feed the B vent through that and its keeps it one inch away from combustible material all around.
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Old 08-26-2011, 05:58 PM   #6
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gas furnace flue clearance


Guy at the local fireplace shop said to use Durarock non-combustable sheet rock.

Anyone know anything about these non-combustable sheets? I understand they are sold at HD/Lowes.

Sounds like cheap insurance to me.
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Old 08-27-2011, 04:40 PM   #7
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gas furnace flue clearance


Durarock is used behind fireplace units that are just outside the wall,usually in a corner.It has a fire rating.
That is what I would consider overkill but it certainly wouldn'hurt anything as long as all exposed wood and normal drywall is covered with it.
Like others have said ,what you need are a few firestop metal pieces .They are cheap and anybody that sells oval b" vent will have them..When installed in the chase and the B vent is installed in them,it will hold the vent the proper 1" away from combustibles.
Now all that said I would check and find out if your unit is exceeding the required temp rise.Ifd thats the case you might have problems with the vent,any blower on it or even gas pressure or wrong size orfice.
good luck

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