Master Flow 48 in. x 120 in. Duct Board - R-6

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.