Opposed Blade Volume Damper 3000-0BD-50X30 Step Down Ceiling Diffuser 2x4 T-Bar (20" x 44"

2x4 T-Bar (20" x 44" duct)

Nylon bushings on adjustable blades to prevent metal on metal rattle

Designed for protection of ceiling openings in fire rated floor/ceiling assemblies with fire resistance ratings of 3 hours or less

Available 6

2 position adjustment for heating and cooling seasons

Opposed Blade Volume Damper 3000-0BD-50X30 Step Down Ceiling Diffuser 2x4 T-Bar (20" x 44"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.