Opposed Blade Volume Damper 3000-0BD-68X48 Commercial Square collar designed for 20”

Square collar designed for 20” × 20” duct

One piece stamped steel frame on most common sizes

Countersunk mounting holes for flush appearance

Standard Features * Individually adjustable steel curved blades * Lever operated steel multi-shutter damper * Pivoted steel blades for easy firm positioning * All component parts

Standard Features * T-Bar lay-in filter grille with steel removable perforated face * 3/16" holes on 1/4" staggered centers * 20" x 20" x 1" filter (not included) * Square collar for 20 x 20 duct * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * Square to round No Labor Collar

Opposed Blade Volume Damper 3000-0BD-68X48 Commercial Square collar designed for 20”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.