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Tool Talk Discussion Forum

chimney for wood stove

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blast52

10-20-2007 04:11:12




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Can a wood stove be vented thruthe same chimney as an existing fuel oil furnace safely?
What would be the proper location of the inlet to the chimney for the wood stove?
Thanks for any advice.
B52




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Eric SEI

10-20-2007 19:44:27




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
If the chimney is large enough you might be able to run 2 liners through it. Our woodstove uses a 5 inch stainless steel liner in a 8 x 12 chimney.



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36 coupe

10-21-2007 04:45:51




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 Re: chimney for wood stove in reply to Eric SEI, 10-20-2007 19:44:27  
A 5 inch chimney is not enough for a wood stove.The 8 inch tile used to line chimneys measures 6 inches inside.



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Dave Sherburne NY

10-20-2007 14:29:24




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
Try this National Fire Protection Association



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PJH

10-20-2007 11:55:01




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
My insurance man insisted that I disconnect either the gas furnace exhaust, or the wood furnace exhaust from our chimney. He further stated that if I had a fire and the investigator found evidence that both exhausts were connected to the same chimney, they would resist paying. The gas furnace had a free flow of draft like the oil furnaces mentioned below. I unhooked them both and put in an outside wood furnace. This was eight years ago - rules may have changed. . .

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Joe in MN.

10-20-2007 05:47:36




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
I would think it depends on a few items --- if the Chimney is extra big and at least 2 feet plus above the roof for proper draft --- AND IF you never burn both heating units at the same time --- THEN --- put the wood burner above the oil burner to the chimney and I think it would work --- but you have to never burn them both at the same time becuase a chimney can do the job for only one at a time if big enough for draft issues ...

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jdemaris

10-20-2007 10:11:58




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 Re: chimney for wood stove in reply to Joe in MN., 10-20-2007 05:47:36  
I don't believe the Uniform Building Code will allow what you decribe for two reasons. #1 - the oil furnace portion of the chimney does not have a damper that close's tight and creates a chimny fire hazard. #2 - in regard to having the "large" chimney code only allows up to a max. square-inches of chimney according to the fuel buring device used - if it's too big it does not heat up properly - builds up with creosote - and again creates a chimney fire hazzard.

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36 coupe

10-21-2007 04:51:02




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 Re: chimney for wood stove in reply to jdemaris, 10-20-2007 10:11:58  
The oilburner uses a blower in the gun that could force wood smoke back in to the house if both operated at the same time.



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Joe in MN

10-20-2007 10:53:50




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 Re: chimney for wood stove in reply to jdemaris, 10-20-2007 10:11:58  
That may apply to some Cities or States --- but where I live in the Country that's not an issue --- Chimny Fires are cause by being to HOT and something to burn off -- most home type Chimny's are in the 8 inch range and a approved liner is required --- the key in my note is that you cannot use two heating systmes at one time --- the hotter one has to be above the less hotter one on the smoke stack .....

in Boiler systems where there is more then One Boiler on line --- only ONE BOILER can be Fired up --- but you only Need ONE Smoke Stack for more then one Boiler system ---

If you have 2 Boilers --- you are allowed to have just ONE Smoke Stack for the 2 Boilers --- but only ONE Boiler should be Fired up...

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jdemaris

10-20-2007 12:44:06




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 Re: chimney for wood stove in reply to Joe in MN, 10-20-2007 10:53:50  
You say the code is not an issue when living in the country? What part of country? All my properties are in rural backwoods areas - i.e. I've never lived or built anything in or near a city in my life. As I understand it, some version of the International Uniform Building Code is used in every state in the United States and applies to all areas within that state, regardless of how rural. Minnesota started using it in the early 1970s and presently uses the 2000 version (I think). The diference being rural can make is the allowance of buildings not classified as "residential structures" - and with them, the code is not as strict - e.g. a hunting cabin, seasonal cottage, etc. In regard to chimney size - I was referring to large chimneys - and some are 14" square or larger - especially if a fireplace in involved.
One of mine is 16" square. International Code does not allow oversize chimneys because they don't get hot enough to prevent creosote. I can use the 16" chimney for my fireplace but not a small wood stove. From what I've read over the years as the International Code evolves - is - what I said previously - about running a oil burner into the same chimney as a wood burner. The oil burner does NOT have a fixed damper shut-off - it will always allow air into the chimney - especially if it has an automatic draft regulator. So, putting a wood stove or furnace into the same flue creates a fire hazard because there is no means of shutting off air to the chimney and choking a chimny fire. Code requires all solid-fuel burning devices to have a shut-off damper - including wood stoves, wood furances, coal stoves, open fireplaces, etc. Oil and gas burners do NOT have them. And - I believe that is the minimum code - some states add to it and make it stricter. If you claim to live somewhere - in a residential structure that no version of the Uniform Building Code does not apply - where is it?

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Joe in MN

10-20-2007 13:28:46




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 Re: chimney for wood stove in reply to jdemaris, 10-20-2007 12:44:06  
You have to look over all options and follow the code --- some cases are permitted and some are not --- if you send your email address I can send you a example picture ...



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jdemaris

10-20-2007 14:10:23




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 Re: chimney for wood stove in reply to Joe in MN, 10-20-2007 13:28:46  
Don't get me wrong - this is not something I'm looking to do. I heat with wood entirely, a house and a large barn. Two wood furnaces, one woodstove, one wood cook stove, a Rumford cooking fireplace, and a wood-bake oven. Also have oil-hot air as a back-up that's only used if we go away somewhere in middle of winter. We have many chimneys - and I would never hook a wood fired unit to any chimney that could not be shut down via a damper. In regard to code - if you have something - that shows Code allowing a gas or oil device vented into the same flue as a solid fuel burning device - in a residential structure - then yes - I'd like to see it. Email at: [email protected]

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jdemaris

10-20-2007 05:42:47




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
No, not safely. THe main reason being - with a chimney intended for wood fires - you need a way to shut off all air to it in case of a chimney fire - via a manual pipe damper. When you share the woodstove with a oil-burner chimney - it gets too convoluted and the oil smoke pipe has no normal draft shutoff - just an automatic draft regulator.
That's why International Uniform Building Code does not allow it.
Technically - it could be done by installing a manual shut-off pipe damper on the oil-furnace pipe - and keep it closed while using the wood stove. But, if your oil furnace came on - you'd get gassed to death with carbon monoxide.

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Roy Suomi

10-20-2007 04:43:52




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 Re: chimney for wood stove in reply to blast52, 10-20-2007 04:11:12  
I was told no because of creosote buildup causing carbon monoxide to enter living spaces instead of going up the stack..I put up it's own dedicated stack to eliminate any problems..I would imagine there would be a draft issue if the furnace came on while the woodburner was in use..My wifie got rid of my Brunco woodburner fireplace insert a couple of years ago to go to gas logs..What a blunder that was..In the spring I'm going to put up a stack on the back of my Florida room and build a nice stove to help heat that end of the house..

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tiresntracks

10-20-2007 14:40:22




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 Re: chimney for wood stove in reply to Roy Suomi, 10-20-2007 04:43:52  
I don't know the answer to the original question, but I have a couple of comments. The Universal Building Code isn't a law itself. It can be the code for your county or city only if they choose to adopt it as their building code. They can write their own codes if they want to.
Also dampers haven't been put in wood stove pipes around here for several years. Something about creating more pollution when dampers are closed.

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36 coupe

10-21-2007 04:39:13




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 Re: chimney for wood stove in reply to tiresntracks, 10-20-2007 14:40:22  
A stove without a damper Will be hard to control and let too much heat out the chimney.Fellow I know tried it and destroyed the chimney.New stoves Ive looked at have a damper mounted on the stove and the plate is welded to the spindle so you cant remove them.I have learned a few things in 70 years about wood stoves.I sold 250 stoves in the 70s when oil prices took off.Chimneys built out side of the building are worthless.A friend who cleaned chimneys for a living found outside chimneys full of ice.He had an oil burner gun he used to melt the ice.A chimney inside a building that is completly covered up will run dirty.Cold chimneys make a lot of creosote.Stove with thermostats are chimney pluggers,They shut off all air supply at times.Green sugar maple will plug a chimney with a sticky goo.You are making maple syrup inside your chimney.I have built chimneys.Using concrete block above the roof line isnt good.Ive seen concrete block crumble when exposed to the weather.Saw a few chimneys built with out clean out doors when I was on the fire dept.Soot builds up on these till it covers the smoke pipe hole and fills the house with smoke.I never know chemical cleaner to work,Most are common salt with a few grains of copper sulfate to make the fire burn green colored for a while.The salt is dyed pink in some cleaners.I tried one of the 14.00 chimney cleaning logs with poor results.

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