Original heating trade vintage catalog for SINGER MANUFACTURING COMPANY. Main office was located in Somerville, NJ. Manufacturers of Diehl ventilator electric fans for attic ventilation. Selection, installation, ventilator types, and accessories are featured, specs provided. Includes type EA, PUD and PA. Disbound from a large 1956 electrical construction materials book, this unique old eight page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro electric fan equipment library. Pages are detached and contains a small amount of residual glue on edge.