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Dampers above 80 square inches free area will be provided with blade insulation
Nylon bushings on adjustable blades prevent metal on metal rattle
Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
Minimum size is 4"x4"
904 - Double Deflection Adjustable Aluminum Blade Grille For a 34" x 18" Duct Opening (front blades parallel to shortest dimension)
Volume Damper Low-Leak OBD 3000-0BDLL-24X34 Commercial Dampers above 80 square inchesh3. 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.
