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One piece curved frame with gasket fits flush to spiral pipe
round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U
Flush core and frame provides smooth surface
Countersunk mounting holes for flush appearance with color matching Phillips Pozidriv screws
Parallel Volume Damper Low Leak 3000PLL-60X36 Residential Registers & Grilles One piece curved frame withh3. 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
