Profile: Hart & Cooley, Inc. are manufacturer's of residential and commercial lines of registers, grilles, and diffusers. We also produce products like classic decorative floor and wall registers, duct system components, fan systems and aceesories, special vent, chimney liners, and flexible air ducts. Our polyethlene jacket air ducts offer a durabl, scuff-resistant black polyethlene vapor barrier which provides improved protection against damaging ultra-violet light. Our Model SFC - Single-Wall Flexible Gas Vent Connector is available in single-wall flexible construction. It includes an integral appliance draft hood connector for fast installation. It requires only 1" clearance to combustibles. It is available in 3"-5" diameters and 1'-5' lengths.