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1/2" spacing dual angular louvers
Countersunk mounting holes for flush appearance with color matching Phillips Pozidriv screws
Ceiling opening must be 4” larger in length and width than the nominal duct size
Available 4" thru 40" round
Standard Features * 2561 - Square or rectangular fire door for vertical mount only
Parallel Blade Volume Damper 3000P-52X50 Smoke-Fire Damper 1/2" spacing dual angular louversh3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee 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. Options * 3000 PLL Low Leak Air Control
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