Caulk Duct Sealant Alum 10.5oz Pro-Air

800-008 Pro-Air Duct Sealant – UL 181 AM-BM Listed

Water-based fiber-reinforced duct sealant/mastic formulated for indoor/outdoor use. Meets U.L. Class 1 rating and local codes while featuring long term flexibility and strength. Use on metal heating, ventilating, and A/C duct systems; as well as fiberglass duct board systems and flex duct systems.
Recommended for use to 10in. of water column pressure without the need for fiberglass mesh reinforcement.