10 Year Indoor Warranty – Iron-Grip 601 is a versatile, all purpose, fiber-free, duct sealant for use on all types of metal duct, glass fiber duct board, and flex duct, as well as duct fabric and flexible tubing runouts. Distinguished by its ability to accommodate minor vibration and movement, Iron-Grip stays flexible to save call-back labor. Iron-Grip’s excellent coverage rates and easy brush-on application provide low installed cost. Iron-Grip 601 is UL 181 B-M Listed Passes ASTM C-731, ASTM D-2202. USDA, EPA and FDA Approved. LEED compliant SCAQMD Rule 1168. City of Los Angeles Approval RR #8069 10 Year Outdoor Warranty when combined with an AFT-701 combination system.