Opposed Blade Volume Damper 3000-0BD-68X68 T-Bar 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening  (front blades parallel to shortest dimension)

Available in 6”–12” collar sizes

SD52 - Transition Box Spiral Pipe Grille (Single Deflection)

screw holes and color matching panhead screws * Standard Color

Nylon bushings on adj

Opposed Blade Volume Damper 3000-0BD-68X68 T-Bar 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.