Parallel Volume Damper Low Leak 3000PLL-28X18 past 12 months 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 14" Duct Opening (front blades parallel to shortest dimension)

Surface mount fixed blade grille with airfoil blades at 0°

Steel construction

For damper free area chart A click here * 2563 - Out-of-Airstream fire door

Parallel Volume Damper Low Leak 3000PLL-28X18 past 12 months 904 - Double Deflection Adjustableh3. 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