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.
NSN 5990-01-061-5618
NSN 5990-01-493-4039
NSN 5975-01-068-4125
NSN 6220-01-552-4395
NSN 6135-01-354-5535
NSN 6645-01-463-4314
NSN 5996-01-368-4875
NSN 5935-01-605-1513
NSN 5945-01-501-8715
NSN 5965-01-320-9742
NSN 6240-00-334-6766
NSN 5915-00-518-1644