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round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U
2550 Series Engineering/Performance Data
2" ADC compliant round collar with bead for ease of installation (square sizes only)
3/4" round collar
Opposed Blade Volume Damper 3000-0BD-66X30 Smoke-Fire Damper round collar only) * 830h3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee 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.
