Duct-Seal 321 is a GREENGUARD Gold-certified, all-purpose, industrial-grade duct sealant for all types of metal duct, fiberglass duct board, duct fabric, and flex duct. It includes UV inhibitors for extended outdoor exposure and built-in fiber reinforcement for added strength. This non-toxic water-based product is solvent free and is suitable for residential use
Features:- All-purpose, industrial-grade duct sealant
- Enhanced UV inhibitors and mold/mildew resistance
- GREENGUARD Gold certified, LEED V4 qualified
- Passes SCAQMD Rule 1168, Department of Homeland Security approval