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 6650-00-125-6560
NSN 6610-01-371-3006
NSN 5925-01-322-3882
NSN 2925-00-644-0028
NSN 7035-01-313-6973
NSN 6620-00-120-0974
NSN 5895-01-392-0294
NSN 6610-01-503-0153
NSN 4140-01-280-5364
NSN 5985-01-579-3450
NSN 6645-01-005-8622
NSN 5950-01-473-7595