Volume Damper Low-Leak OBD 3000-0BDLL-70X34 Smoke-Fire Damper 055 T6 extruded aluminum *

055 T6 extruded aluminum * Five air patterns: 700 CB10 - one way

Standard collar diameter is the same as the diffuser size

Fractional Sizes

Filter retention tabs

Maximum dimension 60w x 52h

Volume Damper Low-Leak OBD 3000-0BDLL-70X34 Smoke-Fire Damper 055 T6 extruded aluminum *h3. 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.