Original roofing trade vintage catalog for OCTAGON VENTILATOR COMPANY. Main office was located at 5832 South Oakley Avenue, Chicago, IL. Manufacturers of Roof Ventilators. Products include exhaust fans, louvent, airphlo power ventilators, air-x-it, siphon, air intake unit, ridgevent, dualvent are discussed. Dampers type A1, A2, M1 and M2 are shown. Unbound from a large 1958 architectural catalog, this unique old twelve page technical brochure would display beautifully matted and framed. Nice cover graphics. A marvelous addition to your retro roofing construction library. Pages are detached and contain a small amount of residual glue on edge.