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Greenheck Fan Corporation
30x6 FSD-311 Combination Fire Smoke Damper w/ 16" 20GA Sleeve, Vertical Mount, 120V Actuator, RRL, 1.5 HR UL-Rated
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10x6 MBD-10 Single-Blade Balancing Damper w/ Hand Quadrant
Honeywell
Honeywell MS7520A2213 Actuator, 175 lb/in, 24V, 2 Aux Switches
30x18 VCD-20 Control Damper w/ Hand Quadrant, 3V Blades