Duct Insulation, 1In x 24In x 48In Price For: Each Material of Construction: Fiberglass Standards: ASTM C612, Type IA, ASTM C612 TypeIB, ASTM C553 Type III, HH-I-558C, HH-I-558B, ASTM E-84, NRC 1.36, MIL-I-24244C, UL723, NFPA255, ASTM C795, ASTM C1136 Item: Duct Insulation Length: 48" Type: Board Width: 24" Temp. Range: -32 to 450 F Unfaced Side, -32 to 150 F Faced Side Jacket Material: Foil Scrim Kraft Thickness: 1" Density: 3 lbs. Approx. R Value: 4.3 Color: Silver Country of Origin (subject to change): United States