HomeTake-Off Balancing Dampers and ActuatorsModel ZTC Conical Take-Off DamperModel ZTC Conical Take-Off DamperDiameter*4"5"6"7"8"9"10"12"14"16"18"Stick-On Gasket on Flange*YesNoFactory Installed Zipset Actuator?*YESNOQuantity*Add to RFQConical Take-off damper reduces pressure loss and attaches to rectangular ductwork.