Original heating trade vintage catalog for BARBER-COLMAN COMPANY, was located in Rockford, IL. Manufacturers of Uni-Flo Grilles and Registers. Model E, F, M. Air-Lite, Spun Aluminum Ceiling Outlet, Supply Outlet, Combined Ceiling and Supply and Return. Disbound from a large 1933 builders heating catalog, this unique old two page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro heating equipment library.