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Countersunk mounting holes for flush appearance
Blade lock to secure blades once the product is activated
Adjustable modular cores with fixed curved blades
Recessed screwdriver operated Opposed Blade Damper
Free area equals more than 75% of nominal size
Volume Damper Low-Leak OBD 3000-0BDLL-66X40 Specialty Products Countersunk mounting holes for flushh3. 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.
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