flue requirements

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  #1  
Old 04-02-03, 09:54 AM
huckw
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flue requirements

I've got a house with a relatively modern (1987) gas furnace that is vented up the existing chimney (through galvanized sheetmetal stovepipe), and the chimney takes up a lot of space in my kitchen (about 2 x 2.5 feet), as well as in the attic I'm about to finish. I also have a gas water heater vented through it. If the code is likely to allow it, I'd like to take out the chimney and replace it all with a more space saving vent arrangement. I presume the furnace is not the kind of high-efficiency unit that can be vented directly out the side of the house (or I assume that would have been done on install).

What, generally, are the minimum requirements for spacing, insulation, surrounding materials, etc.? Can I improve on this arrangement substantially...or should I just deal with it? (If anyone knows the specific codes, I'm in Minnesota.)

Thanks,

Huck
 
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Old 04-02-03, 11:02 AM
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new flue

If you have an older furnace with the regular vent on it. You should be able to take and pull out what you now have and put up a new Type B gas vent pipe. Where you buy it should have a chart that will give you the size you need for the furnace + the water heater vent also . You have to run it on up to clear the roof line. With this pipe you should only need a 1" air space around it to box it in. Still check out code there . you could get by with just about12"X12" after you drywall it in ED
 
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Old 04-02-03, 11:30 AM
huckw
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Thanks, Ed! 12"x12" is pretty much what I was picturing, and hoping I might get away with. I'll check the codes before I do anything with it, though. Very cool!
 
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Old 04-02-03, 05:06 PM
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if your furnace

still has the paperwork with it, the venting table may be included in it
 
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Old 04-03-03, 06:00 AM
huckw
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I don't know if I've got the paperwork yet or not - I'll check. If my memory serves, it's a Lennox G16 Q3-75-5. It's only got a 3" vent stack at the moment, tied in with a 4" water heater vent stack (why is this bigger?), both of them running into a 6" stack heading up the old chimney.

Huck
 
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Old 04-03-03, 11:21 AM
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Vent

Boy dont know for sure but think the furnace is a 4" there on that 75 and most water heaters are 3". But any shop or store that has the B vent pipe should have a chart for what size you need ED
 
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Old 04-03-03, 05:43 PM
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tell us location of all vented

equipment, btu rating, estimated horizontal and vertical run and we can tell you what size
 
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