Carlisle’s Duct-Seal 321 is an all-purpose duct sealant created for all types of metal duct, glass fiber duct board, and flex duct, as well as duct fabric and flexible tubing run-outs. 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, the company says.

 Carlisle HVAC Products
900 Hensley Lane
Wylie, TX 75098
(877) 495-4822