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Square collar designed for a 20” × 20”
are enclosed in the valve to assure trouble free operation * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Steel multi-shutter damper * Soft White Options * 845 O - steel lever operated opposed blade damper * Tamper proof screws * Standard Color
Airfoil blades individually adjustable on 3/4" centers
PERFORMANCE DATA 907 Series Engineering/Performance Data
round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U
Parallel Volume Damper Low Leak 3000PLL-60X28 Smoke-Fire Damper Square collar designed for ah3. 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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