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Countersunk mounting holes with color matching Philips posi-drive screws
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 20" Duct Opening (front blades parallel to shortest dimension)
125") Aluminum Construction 12 GA Steel Construction
3 hour fire resistance rating
425 Series Engineering/Performance Data
Parallel Blade Volume Damper 3000P-68X36 Commercial Countersunk mounting holes with colorh3. 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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