Abstract: A low cost air damper that provides a good seal with low torque requirements. Blade seals of square cross sectional configuration are provided on each damper blade so that the blade seals engage adjacent blades before the blades are fully closed. L-shaped side seals and multiple discs that receive the ends of the blades serve collectively to seal between sides of the damper frame and the blades when the blades are closed even when the blades are not cut precisely. One edge of the L-shaped side seals engages and seals against the discs and the other edge of the side seals laps over and seals against a flat side of the blades and against the square blade seals. A low friction coating is applied to the side seals to further reduce friction.

Abstract: A door handle system for a door employing a plurality of door handles that operate in unison. Each door handle comprised of a lever with a perpendicular shaft, and the shaft extending through sequentially and securing together the following additional elements of the door handle to insure that the latch mechanism rotates together with the lever: a sealing washer, snap bushing, handle opening through the door, second bushing, collar and latch mechanism. An arm provided on each latch mechanism that attaches to a common bus bar. An outwardly extending tongue provided on each latch mechanism for engaging either a door facing or a tongue receiving bracket attached to the door facing to latch the door in a closed position. A lock bracket on the door with a lock opening to align with a lock opening provided the lever for padlocking the lever closed.