Opposed Blade Volume Damper 3000-0BD-54X50 past 12 months SD34 - Transition Box Spiral

SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)

Standard Features * Full size fixed bar blade T-Bar lay-in return air grille *

Minimum size 4"x4"

3/16” holes on 1/4” staggered centers Extruded aluminum frame with signature line marks Perforated material 58% free area Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws Rust resistant pre-coat with durable powder finish Soft White

Nylon bushings on adjustable blades to prevent metal on metal rattle

Opposed Blade Volume Damper 3000-0BD-54X50 past 12 months SD34 - Transition Box Spiralh3. 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.