Volume Damper Low-Leak OBD 3000-0BDLL-42X40 Residential Registers & Grilles Step down core designed for

Step down core designed for 4-way uniform air distribution

SD52 - Transition Box Spiral Pipe Grille (Single Deflection)

Available 4" thru 40" round

Adjustable directional dampers with shut-off

Standard Features *

Volume Damper Low-Leak OBD 3000-0BDLL-42X40 Residential Registers & Grilles Step down core designed forh3. 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.