nemo
New Member
Posts: 48
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Post by nemo on Oct 3, 2015 13:45:26 GMT -8
The vertical flue that goes out through the roof has no pull whatsoever. I made a small fire under it( I have a door that alows acces there)and it started pulling good, made the fire in the feed aand started rockety. BUT, after 10min the pipe cooled and the thermal mass was full of gasses. In the feed smoke and fire comin out the wrong way, no pull. Tried to heat the vertical pipe again but the flame died as soon as I got it close to the door. Gasses and smoke everywhere.... Why did this happen? House is just finished missing the windows. Temp outside 13-15C. There must be some air, gasses phisics i don' t get?
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Post by satamax on Oct 3, 2015 14:13:54 GMT -8
Is your mass still wet? I would Say that's normal. Go to the dumpster, get a fridge fan with the aluminium blades. Fit That on top of your chimney in the meantime. Check for restrictions and bottlenecks everywhere else. Insulate or add mass to your chimney. Double check your lenght of pipe, and the elbows. To see if it's not too much for your system.
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Post by satamax on Oct 3, 2015 14:16:01 GMT -8
Forgot, house temp equal to outside temp, results in no draft.
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nemo
New Member
Posts: 48
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Post by nemo on Oct 3, 2015 20:43:54 GMT -8
Thanx sata! I think the equal temp is the cause.
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Post by dustylfc on Oct 4, 2015 0:12:55 GMT -8
Thanks max for that info With that in mind how does an outside system work properly?
I ask this because that's what am planning maybe different designs as am using masonry heater style with batchbox
Would it be the case of priming the chimney or insulating it fully
I have read cob benches do take several burns to dry out and work properly
Thanks again for the questions and info more learnt
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Post by satamax on Oct 4, 2015 1:54:58 GMT -8
Dusty, it's true that i haven't given much thoughts to an outside system. Basicaly, on outside systems, you rarely have the same lengh of pipe as inside ones. Less elbows too may be. And if you do, and your system is on the verge of stalling, you will have to rely on the pull created in the heat riser. Which isn't much, but exists. I think multi channel massonry heaters need to be primed anyways. Even with a bell. If the chimney hasn't any pull, you will have to burn newspaper in there to prime it. Sometimes, insulmating the chimney can be counter productive too. If it insulates the chimney from the heat of the house. But if you prime it, it keeps the warmth needed to start the draft for longer. Imho, if possible, any lengh of metallic chimney outside should be insulated, to avoid condensation. And massonry chimneys could benefit from that too. On an outside system, a daft fix, could be to paint the chimney black, so the sun warms it up
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Post by dustylfc on Oct 4, 2015 13:04:06 GMT -8
Hahahaha not much sun in the north of England but plenty of blow torches.hehehe
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Post by satamax on Oct 5, 2015 0:13:45 GMT -8
Where in the north? I've lived around some bits of britain!
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Post by dustylfc on Oct 5, 2015 3:21:05 GMT -8
North west England Near Liverpool
Plenty of rain is the norm
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Post by satamax on Oct 5, 2015 4:46:01 GMT -8
Scouceland! I lived a smidge further south east, in east midlands, in Newark (which is the anagram of wanker by the way! ) And further north, in Widgyland!
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adiel
Junior Member
Posts: 119
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Post by adiel on Oct 5, 2015 4:47:02 GMT -8
The vertical flue that goes out through the roof has no pull whatsoever. I made a small fire under it( I have a door that alows acces there)and it started pulling good, made the fire in the feed aand started rockety. BUT, after 10min the pipe cooled and the thermal mass was full of gasses. In the feed smoke and fire comin out the wrong way, no pull. Tried to heat the vertical pipe again but the flame died as soon as I got it close to the door. Gasses and smoke everywhere.... Why did this happen? House is just finished missing the windows. Temp outside 13-15C. There must be some air, gasses phisics i don' t get? did you check the manifold? make a bypass if you can. it makes heating up the chimney much easier.
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