Original heating trade vintage catalog for WESTERN ENGINEERING MANUFACTURING COMPANY. Main office was located at 4116 Glencoe Avenue, Venice, CA. Manufacturers of Ventilators. Products featured include Rotary Ventilators, Forbes Syphoaire, Amvent, Econovent, Continuous Ridge, Airout, and Booster Fans are discussed. Letter from the California Institute of Technology explains analytical procedure employed in actual wind tunnel tests displaying the high efficiency of the Rotary Ventilators. Unbound from a large 1958 architectural catalog, this unique old eight page technical brochure would display beautifully matted and framed. Nice cover graphics. A wonderful addition to your retro ventilation equipment library. Pages are detached and contain a small amount of residual glue on edge. (Bulletin No. 58).