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For damper free area chart A click here * 2563 - Out-of-Airstream fire door
904 - Double Deflection Adjustable Aluminum Blade Grille For a 34" x 18" Duct Opening (front blades parallel to shortest dimension)
Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
parallel to longest dimension
Surface mount fixed blade grille with airfoil blades at 0°
Parallel Volume Damper Low Leak 3000PLL-28X18 past 12 months For damper free area charth3. 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
