Wood stove chimney piping.

Connecting a wood stove to a previously unused masonry chimney.
Requires two vertical metal sections of flue pipe from top of stove then a 90 degree into metal sleeve mounted in wall of chimney. Clearances from combustible surfaces will be complied with. The metal pipes are tapered (fluted at one end in order to fit each into the next section of pipe etc. At each join the sections will be secured with two sheet metal screws or a large clamp.
Question: Should the tapered ends face back towards the stove, so that condensation or creosote formation, if any, will drain back towards the stove? Question: Or if tapers are in the other direction, away from stove, any such condensation might drain downwards and leak out around the joint?
Advice welcomed; I've referred to a 'Wood Burning' manual but it does not seem to cover exact details of which way round to install metal flue pipes.
TIA Terry
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stove then a

each into the

screws or a

so that

towards the

stove, any such

joint?
it does not

flue pipes.
My understanding is that you want to make sure the creosote drains inside the pipe, so higher piece goes inside the lower one.
Bob
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Terry wrote:

In your case it probably won't make any difference. With a short run from the stove to elboe into the chimney the pipe will get hot and very little gunk coming down the chimney would enter this section. However, for assurance you want the taper down so that any liquid running down the pipe will run inside to the pipe and not run to the outside of the pipe.
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pipes.
Many thanks to Bob and George E for their prompt posting of advice re the above. What a helpful group. Terry.
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Yes, taper down inside the next section. This may require a double tapered section to mate up with the stove and into the collar. Any place selling stove pipe should be able to make one of those. My installation required one.
Harry K
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snip ......
Thanks Harry. My taper will fit OK as is into the cast metal collar which incidentally I am moving from the back of the Jotul #8, interchanging it with the blank plate on top, so that stove will stand closer to masonry wall.behind it. Since I'm doing this 'from scratch' it works out fine. My limited previous experience with metal chimney 'funnel' sections was with a floor mounted 'oil' heater into a brick chimney stack which worked fine for over 11 years. Comments much appreciated. Terry.
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Hi Terry
I had a wood burning insert installed in my fireplace and the company gave me the option of using a short piece of pipe like you described, or a full length pipe that went inside of the existing flue to the top. I did not want to have the possiblilty of any issue with the short run of pipe , so I elected to go all the way up the flue. A little extra money, but I am happy. Michael
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Thanks Mike: Ours is a lined flue originally specifically installed for 'future wood stove' in basement; it has never been previously used. The entrance to the flue is about five and a half feet up out through a concrete basement wall. So the total 'run' of chimney pipe, from the stove, including the 90 degree is about 3.5 feet. The only clearance from combustible material that I have to be concerned about is above this, from the wooden floor joists of the main floor above. I will install either a metal or asbestos shield spaced down from the floor joists to meet safety requirements. We have a fireplace with its own flue in a house room above. We have casually discussed installing an 'insert' in that. If we ever do a separate pipe is a possibility. Thanks for the suggestion. Terry. PS. As it happens the previous owner of this stove did have it in his living room piped from its back directly into his modified/blocked off fireplace. I don't think he was too happy with it; perhaps finding it rather messy. I recall that there was no direct access from outside to his living room. That probably meant his firewood had to be carried from outside through his kitchen and dining area or through the front hall. Also there were two steps 'up' to his living room which precluded the use of a small wood trolley! For our fireplace fuel it is less than ten feet to a 4 x 3 x 2 wood trolley parked on the patio deck immediately outside the sliding glass doors of the room.
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a double

collar. .......

collar which

interchanging it

to masonry

out fine. My

sections was with a

worked fine for

company
described,
the
the
A
It's also a whole lot easier to clean the flue with a continuous pipe to the top. You can run a brush easily down it,and the crud ends up in the stove. You don't have to remove the stove to remove the crud.
Bob
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Bob wrote:

Hopefully there is a clean out at the base of the chimney.
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<snip>
Boy yes! Mine is straight down to an elbo into the stove. The only way to clean it is brush from the top (really an easy job) but then the crud accumulates in the elbo. I have to reach in through the stove door and scoop the crud out by hand. What a dirty job.
Harry K
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