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Extruded aluminum fixed bar blades at 45°
3/4" round collar
Surface mount fixed blade grille with airfoil blades at 0°
904 - Double Deflection Adjustable Aluminum Blade Grille For a 40" x 18" Duct Opening (front blades parallel to shortest dimension)
53% free area * 1306: 3/4" lattice opening
Opposed Blade Volume Damper 3000-0BD-38X20 Commercial Extruded aluminum fixed bar bladesh3. 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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