Original heating trade vintage catalog for THE BURT MANUFACTURING COMPANY. Main office was located at 931 South High Street, Akron, OH. Manufacturers of roof ventilators and wall louvers. Free flow, standard, revolving, thermavent, monitor type gravity ventilator, continuous ridge, dampers & controls, bases, free low fan, exhaust & centrifugal fan ventilators, fixed, adjustable, combination, automatic louvers and louver operators are all discussed. Performance and dimension data chart and exhaust capacities charts are provided. Unbound from a large 1958 architectural catalog, this unique old sixteen page technical specifications brochure would display beautifully matted and framed. Nice cover graphics. A fantastic addition to your retro ventilation equipment library. Pages are detached and contain a small amount of residual glue on edge.