Opposed Blade Volume Damper 3000-0BD-66X48 Commercial round collar only) * 830

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

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

Options Recessed screwdriver operated Opposed Blade Damper

Available 4" thru 40" round

Opposed Blade Volume Damper 3000-0BD-66X48 Commercial 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.