Opposed Blade Volume Damper 3000-0BD-64X22 Step Down Ceiling Diffuser * 2634 - Square or

* 2634 - Square or rectangular Spring actuated (6) out-of-airstream fire damper for horizontal or vertical mount

listed Fire-Resistance Diffuser * TVB - Thermal Vapor Blanket * Square Collar

904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 8" Duct Opening  (front blades parallel to shortest dimension)

Blades parallel to shortest dimension

1-27/32” x 11/32” slots

Opposed Blade Volume Damper 3000-0BD-64X22 Step Down Ceiling Diffuser * 2634 - Square orh3. 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.