Volume Damper Low-Leak OBD 3000-0BDLL-28X12 past 12 months 904 - Double Deflection Adjustable

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

listed Fire-Resistance Diffuser * 700 Series - T-Bar Lay-in Panel * TVB - Thermal Vapor Blanket * Square collar

Minimum size is 4"x4"

Center margins are mounted on the backside of the grille for a streamlined continuous look

SD34 Series Performance Data

Volume Damper Low-Leak OBD 3000-0BDLL-28X12 past 12 months 904 - Double Deflection Adjustableh3. 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.