Volume Damper Low-Leak OBD 3000-0BDLL-58X50 Accessories round collar only) * 830

round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U

1/2" spacing dual angular louvers

Available in even sizes 6" to 20" and 24"

3/16” holes on 1/4” staggered centers Extruded aluminum frame with signature line marks Perforated material 58% free area Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws Rust resistant pre-coat with durable powder finish Soft White

120x120 multiple

Volume Damper Low-Leak OBD 3000-0BDLL-58X50 Accessories round collar only) * 830h3. 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.