The Master Flow 48 in. x 120 in. Duct Board - R-6 features fiberglass construction with an FSK backing for sturdiness over time. Cut this duct board to size and use it to build your own HVAC fittings or trunk duct, and then assemble it with fiberglass weave and mastic or duct-board-approved duct tape for a convenient solution to your ducting problems.
- Fiberglass construction with FSK backing for increased durability
- Can be cut to size as needed to create your own HVAC fittings or trunk duct for your convenience
- Assemble using fiberglass weave and mastic or duct board approved HVAC duct tape for ease of use
- Insulated with an R value of 6 for good hot and cold retention
- UL-181 class 1 rigid air duct listed