1.1 This specification covers the composition, size, dimensions, and physical properties of flexible fiber glass blanket, ductwrap, used to externally insulate HVAC ducts used for the distribution of condition air within the temperature r This specification covers the standard for composition, size, dimensions, and physical properties of flexible glass blanket, ductwrap intended for use to insulate HVAC ducts. The basic materials shall be fibers manufacture from glass processed from the