Original heater trade vintage catalog for AUTOVENT FAN BLOWER COMPANY. Main office and factory was located at 1819 North Kostner Avenue, Chicago, IL. Manufacturers of Exhaust Fans, Heater, Louver, Cabinet and Portable Ventilators, Uniblade Pulley and Motor Driven Blowers, Heating, Drying and Ventilating Equipment. Acid-Moisture-Proof. Disbound from a large 1931 industrial catalog, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro industrial heating equipment library. Slight damp stain on outer edge.