Volume Damper Low-Leak OBD 3000-0BDLL-52X20 Residential Registers & Grilles Opposed Blade Damper standard on

Opposed Blade Damper standard on 4" widths

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)

Attractive concentric ring deflects air stream 360°

Spiral Diffuser Radius Flush Mount Diffuser Single Deflection with Damper

with 53% free area

Volume Damper Low-Leak OBD 3000-0BDLL-52X20 Residential Registers & Grilles Opposed Blade Damper standard onh3. 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.