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 5990-01-591-8797
NSN 5905-01-446-4017
NSN 5996-01-633-7979
NSN 5999-01-591-1275
NSN 6130-01-425-1459
NSN 5950-01-355-2777
NSN 5945-01-634-0588
NSN 5855-01-461-8169
NSN 6145-00-107-7913
NSN 4140-00-880-0759
NSN 6610-00-814-8598
NSN 5915-01-189-6854