AprilAire 6108 Barometric Bypass Zone Control Damper - 8 in.

Insulation proof - All openings secured preventing sprayed-in insulation from entering regulator and causing problems, Obstruction proof - All moving parts protected from external obstructions, Gasket material minimizes air bypass when blade is closed, Common plastic bearing stabilizes damper blade, Hex shaft allows secure blade fastening, Counter-weighted blade allows installation in any orientation, Gap between regulator and damper shell allows damper to be fully insulated, No loose parts - Damper ships completely assembled.