Original heating trade vintage catalog for UNO VENTILATOR COMPANY. Main office and works was located in Cliftondale, MA. Manufacturers of electric weld turbine ventilators. Used on every type of building roofs, such as industrial plants, churches, theaters, restaurants and garages. Methods of installation is discussed. List prices & weights chart is provided. Unbound from a large 1933 architectural catalog, this unique old one page technical brochure would display beautifully matted and framed. Nice graphics. A marvelous addition to your retro roof ventilation equipment library. Light damp stain on top and bottom edges.