Original heating trade vintage catalog for W. F. HIRSCHMAN COMPANY, INC. was located in Buffalo, NY. Manufacturers of roof ventilators and allied apparatus. Products include electric, rotary wind driven & stationary ventilators, dampers, fan motor controls and curbs are discussed. Unbound from a large 1936 architectural catalog, this unique old two page technical specifications brochure would display beautifully matted and framed. Nice graphics. A marvelous addition to your retro roofing construction library. Pages are detached and contain a small amount of residual glue on edge.