A friend has offered me a section of metalbestos chimney. It is compatible with the Supervent I have now?
Have you brought the two together for fitment, or do you mean in terms of the suitability/compatibility of the two different brands working together? If they interlock securely, and you could put the Metalbestos as the top most section, I would do it, but not midway thru the run. My $.02.
My friend is in NJ; he told me he could get a section of the metalbestos for free. I am going to take some measurements and photos and send them to him to see what he thinks; just a way for me to save a bit of money if they are compatible.
I had Metalbest here when first moved in. I changed it to Supervent, and the ends looked the same, although the old was 8" and the new is 6". Same company I believe, and the Hart & Cooley stuff comes in pretty much identical boxes as the Supervent, as well. I haven't looked at the connections on that though.
Though they are both Selkirk pieces, they are not compatible. This is what I have read. Never tried to fit them together. That said, if I needed to extend my chimney and the pieces fit together but didn't lock, I might consider securing them with some short stainless steel screws and a locking band. Maybe. Outside, on the top section, above the roof. Not inside. I'd consider it myself, but never recommend it (disclaimer)