Original heating trade vintage catalog for THE SWARTWOUT COMPANY.  Main office and factory was located at 18515 Euclid Avenue, Cleveland, OH. Manufacturers of Ventilation for Industrial and Commercial. Products include Rotary Ball Bearing Ventilator, Airjector and Dexter Heat Valve. Unbound from a large 1938 architectural catalog, this unique old three page technical brochure would display beautifully matted and framed. Nice graphics. A marvelous addition to your retro ventilation equipment library. Pages are detached and contain a small amount of residual glue on edge.