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Standard Features * Fixed airfoil blades parallel to 1st dimension given *
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 8" Duct Opening (front blades parallel to shortest dimension)
CB20 - two way
Lever operated multi-shutter damper
Building materials rated 3 hours or less
Volume Damper Low-Leak OBD 3000-0BDLL-44X42 Accessories Standard Features * Fixed airfoilh3. 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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