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For damper free area chart B click here * 2565 - Round fire door for vertical mount only
For evaporative cooling or high-velocity exhaust applications
2x4 T-Bar (20" x 44" duct)
blade to blade neoprene seals
18" or 24" lengths * Soft White Options * Standard Color or Designer Color Finish available on this product
Parallel Volume Damper Low Leak 3000PLL-68X56 Residential Registers & Grilles 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
