Lynn Quick Fire 100 Universal Combustion Chamber - 2300F High-Temperature Ceramic Fiber Insulation - Forge, Kiln & Foundry Applications - Model 1001

I could not purchase the correct item from the furnace manufacturer because I I'm not a licensed contractor. . I installed it in combination with the 4" dia air tube cuff, just fitted it to the Blue Angel that I was installing. I would also recommend purchasing some kaowool as well-for ceiling around the cuff to the chamber. I installed this in a Williamson hot air furnace. This took some fitting to be honest, measuring and cutting, at the end of the day though, I have a furnace now that is working thank you Lynn manufacturing.