Original heating trade vintage catalog for HOFFMAN COMBUSTION ENGINEERING COMPANY. Main office and factory was located in Detroit, MI. Manufacturers of Firite stoker with continuous light firing. The coal feeding impeller mechanism distributes the coal evenly over entire grate area. Disbound from a large 1936 industrial heating catalog, this unique old four page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro heating equipment library. Pages are detached and may contain a small amount of residual glue on edge.