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Duct-Seal 321 (5 Gallon)
Duct-Seal 321 is an 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.
Product comes in gray in 11 oz. cartridges, 1 gallon pails, and 5 gallon pails.
More information about this product can be found at
Duct-Seal 321 (5 Gallon)
Duct-Seal 321 is an 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.
Product comes in gray in 11 oz. cartridges, 1 gallon pails, and 5 gallon pails.
More information about this product can be found at