70 or 80 years ago they sometimes used 4 concrete blocks that each had a 1/4 round radius. the 4 blocks together would have an 8" hole for a flue.
Concrete blocks make lousy flues. If you can even find those blocks you should put a stainless liner in it. If you want a masonry chimney use clay flue liners. Better yet use a triple wall stainless chimney. That should be cheaper than hiring someone to build a masonry chimney. Don't try to build one yourself if you don't know what you're doing! Take the money you save by using the triple wall chimney and put it towards some overhead doors.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
... [Read Article]
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