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back blades parallel to longest dimension
Countersunk mounting holes for flush appearance with color matching screws
Spiral pipe diameter must be 4” larger than Height of the duct opening
14 gauge steel construction
Five air patterns available
Parallel Volume Damper Low Leak 3000PLL-24X16 past 12 months back blades parallel to longesth3. 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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