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MPL
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# Posted: 17 Dec 2013 10:17pm
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You should always match the stove collar (at top of stove) with the
same size of pipe (flue). Otherwise, draft (draw) of flue gas will
be affected plus possible over heating of the stove itself. If there is a trade name on the pipe you can look at the manufacturers specification and confirm it is acceptable for wood. When burning wood you also have potential for creosote buildup by using improper flue size resulting in a very high temperature flue fire. Single wall is OK within
the structure until you reach the ceiling which should have a transition collar which protects the ceiling / roof. From the transition collar you should use dbl wall on up.
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neb
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# Posted: 17 Dec 2013 11:09pm
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MPL
I guess what I want to do is run my smaller single wall pipe up through the double wall pipe. The double wall will be down inside the shack about 2' and go up through the roof with single wall continueing up from there. I will put in a drop box plus roof jack etc. I did go look at a guy that has it that way and it has worked just fine for him I will cut out all plywood 2'x2' around where I go through the roof and roof is tin.
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MPL
Member
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# Posted: 17 Dec 2013 11:52pm
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Should work. I sell and install high temperature stoves as part of my trade so I tend to over spec the flue. Just be sure to provide yourself adequate clearance when passing through wood surfaces.
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neb
Member
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# Posted: 18 Dec 2013 08:21am
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MPL
Thanks. So the double wall pipe I got was for pellet and oil will it be fine to use on wood? The guy said yes it would but would you know if he is correct.
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MPL
Member
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# Posted: 18 Dec 2013 10:50am
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The small sizes of double wall flue pipe are made for two types of installations.
1. If there is no insulation between the two pipes it is for exhaust on the inside and combustion air on the outside.
2. If insulated between the two walls it is used for oil and pellet as the combustion gas volume is generally less than a wood stove or
fireplace.
3. If the internal I.D. does not match the stove performance will be
affected. The other potential issue is flue temperature as the
the exhaust gas cannot exit as quickly thereby causing flue
temperatures to rise. You should not leave the stove
unattended until you have worked with it long enough to be
assured it performs ok.
4. Decent quality flue products will be rated by UL and NFPA or
similar agencies. (If rated they generally will have a sticker or
label on the outside of each flue section).
5. Consider purchase of a small "magnetic" flue thermometer
and place high on the flue near the ceiling to allow you to
monitor the flue temperature at that point. They do not
cost much - $15 to $20 + shipping.
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neb
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# Posted: 1 Jan 2014 05:05pm - Edited by: neb
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Well I walked in to the cabin today I think I could of made it driving but didn't want to chance it. I had some things I need to finish up with on the stove and wanted to fire it up. Any way everything worked just fine and nothing was even close to being hot around the stove including the tin or ceiling. I could even put my hand on the pipe for a while before it started to get warm. Yhis stove maybe used 5 to 10 times a year for an afternoon or such. The single wall pipe goes from 24" to 18" from the tin fire wall. Then the stove pipe goes through a double wall and up through the roof. The double wall is 30" inside the shack the rest extends up through the roof with the chimney pipe going throiugh it. In the one picture you can see I didn't have all the blocks placed yet. I had to carry them up from the low land. The trip from where the block where at is about 500 feet and all up hill and winding trail. I got the fire started and then went to get the rest of the block.
Fire in the hole!
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Just
Member
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# Posted: 1 Jan 2014 05:14pm
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a official survival shack, looks great 'neb' congrats
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neb
Member
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# Posted: 1 Jan 2014 05:28pm
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Thanks Chief! Exactly a survival shack it is. Glad to see you are at home and on the mend. A good place to warm up when I'm in the hills and on the river. Again thanks for the help, tips and encouragement in this project.
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