Volume Damper Low-Leak OBD 3000-0BDLL-32X32 Residential Registers & Grilles Square collar designed for a

Square collar designed for a 20” × 20”

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

Adjustable single deflection grille

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 24" Duct Opening (front blades parallel to shortest dimension)

Countersunk mounting holes for flush appearance with color matching screws

Volume Damper Low-Leak OBD 3000-0BDLL-32X32 Residential Registers & Grilles Square collar designed for ah3. 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.