Original heating trade vintage catalog for W. F. HIRSCHMAN COMPANY, INC. was located in Buffalo, NY. Manufacturers of Roof Ventilators and Auxiliary Equipment. Products featured include Effico Wind-Electric Ventilators, Rotary Ventilators, Louver Units, Roof Bases, Hirschman Steel Ventilator Curbs, Equipment, Electric Damper and Motor Control. Numerous images, illustrations, product details, and specifications are provided. Unbound from a large 1938 architectural catalog, this unique old twelve page technical specification 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 on edge. (Architects Manual JV).