Original heating trade vintage catalog for W. F. HIRSCHMAN COMPANY, INC. Main office was located in Buffalo, NY. Manufacturers of exhaust roof ventilators and allied apparatus. Products include Effico wind-electric, F fans, rotary ball bearings, internal louvers, lornate concealed ventilators, electric damper and motor controls are discussed. Numerous images, illustrations, detailed product details and specifications chart provided. Unbound from a large 1933 architectural catalog, this unique old twelve page technical specifications brochure would display beautifully matted and framed. Nice cover graphics. A marvelous addition to your retro ventilation equipment library. Pages are detached and contain a small amount of residual glue. Damp stain on page edges, light bleed through and warped.