Volume Damper Low-Leak OBD 3000-0BDLL-34X20 Residential Registers & Grilles remove the two center cones

remove the two center cones as a unit and reposition the six screws

with 75% free area Options 14 GA 304 SS Construction 12 GA (

Lever operated Opposed Blade Damper

Standard Features * T-Bar lay-in panel with hinged perforated face * Galvaneal steel 2x2 panel with seismic hangers * Spring push release for removal of perforated face * Round No Labor Collar sizes: 6-10"

Square to round 2" collar with roll formed retention bead - available in square sizes only

Volume Damper Low-Leak OBD 3000-0BDLL-34X20 Residential Registers & Grilles remove the two center conesh3. 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.