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2x4 T-Bar (20" x 44" duct)
Non-standard size collar (available in 6" through 20")
1550 Series Engineering/Performance Data
w/ Lever Operated Opposed Blade Damper
Countersunk mounting holes for flush appearance with color matching screws
Parallel Blade Volume Damper 3000P-36X36 Step Down Ceiling Diffuser 2x4 T-Bar (20" x 44"h3. 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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