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Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws
3-hour fire resistance rating
Spiral pipe diameter must be 4” larger than Height of the duct opening
450 Series Submittal
enclosed in valve to assure trouble-free operation
Volume Damper Low-Leak OBD 3000-0BDLL-30X24 Step Down Ceiling Diffuser Countersunk mounting holes for flushh3. 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.
