Magnetic permeability shall be less than 1.2 before fabrication and not greater than 2.0 after fabrication as measured in a oersted field, tube has 60 fins per ft.
A heat transferring unit utilizing a separate source of steam or hot water as the heat transfer medium. It consists of finned parallel tubes joined together by a header or headers and is designed for installation in the ducts of a forced air circulating system. It may be provided with a flanged outer casing to facilitate mounting of the unit in planned or existing duct work. Circulation of the heated air is achieved by use of a blower or fan not integral with the heating unit.
Classification: Air heaters and hot air distributors, not electrically heated, incorporating a motor-driven fan or blower, and parts thereof, of iron or steel
NSN 6150-01-303-8348
NSN 5950-00-255-2232
NSN 5999-01-010-0789
NSN 2925-00-351-1015
NSN 6130-01-020-7307
NSN 5945-01-270-2197
NSN 5985-01-379-4068
NSN 4140-01-164-4935
NSN 5985-01-065-9815
NSN 5925-01-262-4481
NSN 5999-01-161-6809
NSN 4140-01-414-5320