The Air-Cooled Steel Chimney Adapter is designed for installing an ENERVEX chimney fan on air-cooled steel chimney systems, including many single-wall, double-wall, and triple-wall air-cooled chimney pipes. This adapter provides the proper connection point for the fan while allowing the air-cooled chimney system to function correctly at the termination. Choose this adapter when the chimney pipe is air-cooled rather than solid-pack or Class A insulated pipe.