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Ceiling opening must be 4” larger in length and width than the nominal duct size
950 Series Engineering/Performance Data
Dampers above 80 square inches free area will be provided with blade insulation
Square collar designed for 20” × 20” duct
Volume Damper Low-Leak OBD 3000-0BDLL-50X50 Step Down Ceiling Diffuser Ceiling opening must be 4”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.
