F-Seal 181 Fiber Reinforced Water Based Duct Sealant White 1 Gallon For Metal Fiberglass And Flexible Ducts Leak Free HVAC Sealant UL 181 A M B M Certified Indoor Outdoor Durability

Fiber-Reinforced Water-Based Duct Sealant, 1 Gallon, White
✔️ UL 181 A-M & B-M certified for metal, fiberglass, flexible ducts

F-Seal 181 is a premium fiber-reinforced water-based duct sealant designed to stop leaks across HVAC ductwork. It’s suitable for metal, fiberglass, and flexible ducts and performs well in both indoor and outdoor installations.

✅ UL 181 A-M & B-M certified for all duct types
✅ Fiber-reinforced formula for durable, leak-free seals
✅ Indoor/outdoor weather resistance with mold and UV protection
✅ Fast-drying, low VOC for safer use in sensitive spaces
✅ Paintable after full cure and adheres to metal, fiberglass, and flexible ducts
✅ Size: 1 gallon; Color: White

💡 What is a duct sealant used for in HVAC systems and why choose a fiber reinforced water-based option?

This handy sealant helps seal duct joints to prevent leaks and improve efficiency.

- Hand-friendly adhesion to metal, fiberglass, and flexible ducts
- UL 181 A-M & B-M certified for reliability
- Low VOC, fast drying, and outdoor durability