21.000 in.Lg, 2.000 in.Id;
An item composed of one or more materials, molded, compressed, and/or baked into a rigid covering of irregular shapes and sizes. it is designed to cover air ducts and/or air duct fittings used in air conditioning, heating, cooling, pressurizing and de-icing systems to restrict the dissipation of heat. it may completely or partially encase the item for which designed. it may be furnished with or without fillers, cement, and/or separate or attached accessories for installation, (excluding flexible air duct covering and rigid pipe and pipe fitting coverings used in construction and building materials). Excludes insulation blanket, thermal, aircraft; insulation pipe fitting covering, thermal; and insulation sleeving, thermal.
Classification: Other parts of airplanes or helicopters for use in military aircraft (excludes propellers, rotors, undercarriages, and parts thereof)
NSN 5925-00-529-0441
NSN 5965-00-665-2156
NSN 6645-00-310-5839
NSN 5985-01-622-2766
NSN 5998-00-856-3329
NSN 5925-01-347-2052
NSN 5950-00-012-2490
NSN 5950-01-060-5378
NSN 6320-01-551-3553
NSN 6110-01-377-0508
NSN 6150-01-571-4800
NSN 5996-01-655-0308