Opposed Blade Volume Damper 3000-0BD-48X18 past 12 months Ceiling opening must be 4”

Ceiling opening must be 4” larger in length and width than the nominal duct size

Single deflection radius mount spiral pipe grille with adjustable blades

One piece steel frame

Square to round 2" collar with roll formed retention bead - available in square sizes only

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 10" Duct Opening (front blades parallel to shortest dimension)

Opposed Blade Volume Damper 3000-0BD-48X18 past 12 months Ceiling opening must be 4”h3. 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.