Original heating trade vintage catalog for THE AIROLITE COMPANY. Main office and plant was located in Marietta, OH. Manufacturers of Ventilating Louvers, for Doors, Windows, Walls, Ceilings, and Partitions. Provide adequate and efficient ventilation in rooms, corridors, closets and attics. Numerous illustrations and specifications provided. Unbound from a large 1941 architectural catalog, this unique old five page technical brochure would display wonderful matted and framed. Nice graphics. A terrific addition to your retro ventilating louvers library. Pages are detached and may contain a small amount of residual glue on edge.