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Hi! I need to fit a anti down-draught mild steel H cowl to my exiting clay chimney pot. The internal diameter is 8.5". The cowl I am purchasing is 8". Do I secure it with silicone, sand and cement?? Any ideas??

Hi! I have taken out a coal fire which was great but as most of the heat goes up the chimney I bought a multi-fuel burner. The flow of air up the chimney did suffer down draft with the coal fire at first (3 years ago) but a UFO downdraft cowl sorted the problem. I have taken approx 1sq...