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904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 30" Duct Opening (front blades parallel to shortest dimension)
Damper manufactured from corrosion tested galvanized mild steel (G-90)
Options 14 GA 304 SS Construction
Standard Features * 4000 - door core grille with single frame * 4100 - door core grille with additional loose frame *
Divided 2-way multi-louver and combination shut-off
Opposed Blade Volume Damper 3000-0BD-22X10 Accessories 904 - Double Deflection Adjustableh3. 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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