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WebChimneys are built to promote the upward progress of smoke, and among their many parts is the flue—a smooth secondary layer on the chimney’s inner walls that eases the smoke’s passage, protects the masonry from deteriorating effects of acids in smoke and prevents any smoke or gases from entering the house through cracks in the masonry. WebStep 5. Close the window, leaving around 2 inches above and below the pipe. Cut a metal sheet to the dimensions of the opening below the partly closed window. Drill a hole in … orchidex afff 6% ul

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