hpmer
Full Member
Posts: 240
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Post by hpmer on Sept 11, 2013 14:14:12 GMT -8
Do you think that the bat insulation would allow the elimination of the interior flue tile in the first box? If I understand correctly it was doubled up to prevent the outer one from cracking.
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Post by endrunner on Sept 11, 2013 19:05:19 GMT -8
The sizes I've seen here have an interior dimensions of 20x20, 25x25 or 30x30cms. Do you think the 30x30 would work for a 5" system or a bit small? Endrunner, I'm interested, how do you fix the ceramic blanket to the wall? Also, do you think they would have to be split for inner flue positions because the outer layer would crack with the heat if unprotected? 30x30 is a bit small, but you go higher The blanket is stiff enough to stay in place without adhesive. Then we coat it with a rigidizer to protect it and reduce ash build up. The flues will crack if unprotected. If you use insulation to protect your outter flue, you will slow heat transfer significantly. Lining with fire brick is an alternative, but it takes more time to build and is more expensive, but will perform better.
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Post by wrekinwanderer on Sept 15, 2013 12:46:48 GMT -8
Thanks for your reply Endrunner. I haven't seen any bigger chimne flues here, in Northern France, but shall be on the look out.
Is the rigidizer an off the shelf product specifically for ceramic blanket or is it often sold for another purpose?
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Post by satamax on Sept 15, 2013 13:15:11 GMT -8
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Post by endrunner on Sept 27, 2013 21:26:54 GMT -8
The rigidizer is an off the shelf product made for ceramic blankets.
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Post by aoakley on Oct 1, 2013 20:38:45 GMT -8
Any reason this castle build couldn't be constructed from standard red brick instead of the flue liner? Think I'd still need the double wall bell? I'm thinking a 4" system for my small space, but am having a hard time with the cost of the flue liner when I have a stack of brick just waiting to be used again.
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Post by endrunner on Oct 2, 2013 6:15:17 GMT -8
Most brick can not handle the thermal shock very well from the 1st bell. However, you could certainly use them for the exterior layer in the castle build. In other words, Use the split flue liners for the interior of the bell, then use brick instead of the exterior flue set. This way you would only need 6 ft of the smallest flues. 13x13 could be used, these are only about $10 a piece, so $60. It will take more time to build but will give you a nice finished look.
The container for the burn tunnel and heat riser could also be brick. You will still need to use the ceramic blanket and insulated collars to protect the brick from the intense heat above the heat riser and as these hot gases move into the 1st bell.
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Post by aoakley on Oct 2, 2013 10:49:01 GMT -8
Thank you. That will make the build much more reasonable in cost. I was quoted about $600 for all the flue liners, and another $120 for a 50lb bag of refractory mortar/cement.
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