Original heating trade vintage catalog for THE AIROLITE COMPANY. Main office was located in Marietta, OH. Manufacturers of ventilating louvers for doors, walls, windows and ceilings for modern ventilation. Vertical sections are featured. Unbound from a large 1958 architectural catalog, this unique old twelve page technical brochure would display wonderful matted and framed. Nice graphics. A terrific addition to your retro ventilation equipment library. Pages are detached and may contain a small amount of residual glue on edge.