Foster Duct-Fasâ„¢ Duct Sealant is a fire resistive, water based, indoor/outdoor, U.V. resistant, non-fibrated sealant for use on low, medium and high velocity ducts to form an extremely flexible, yet durable seal against air leakage.

Duct-Fas Duct Sealant is ideal for sealing ASJ, FRK, and FSK jackets and board facings at joints, laps and over staple and weld pin punctures, and for sealing flexible air ducts to rigid connectors.

Duct-Fas Duct Sealant meets requirements for LEED IEQ 4.1 Low-Emitting Materials, Adhesives and Sealants. VOC: 24 g/l, less water and exempt solvents.

Duct-Fas Duct Sealant will meet all SMACNA pressure classes up to 10″ w.g.