ShurFLEX HVAC non-printed professional grade metalized cloth duct tape designed for airtight and moisture-free seaming, connecting, splicing, patching and sealing of sheet metal and flex duct, rigid duct boards, air vents, insulation, fibrous filter banks and pollution collection systems. For superior performance, SF 682 is easy to use, hand tearable and designed in color and appearance to match sheet metal, flex duct and duct board.