Volume Damper Low-Leak OBD 3000-0BDLL-66X18 Step Down Ceiling Diffuser Extruded aluminum surface mount frame

Extruded aluminum surface mount frame with signature line marks

120x120 multiple

built-in vanities

Lever operated multi-shutter damper

Volume Damper Low-Leak OBD 3000-0BDLL-66X18 Step Down Ceiling Diffuser Extruded aluminum surface mount frameh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.