Use heavy-duty, long travel actuators to operate curtains or air inlet baffles. The 4,000 lb. capacity reduces the number of machines needed for longer buildings. Unique ball bearing screw design delivers 90% of motor's power to cable, providing lower power use and increased reliability. Quality drive motor features internal electric brake for precise positioning of curtains. Built-in header features greaseable needle-bearing pulleys to allow lift cables to exit in any desired direction. Curtain machines can be customized, at the factory, to fit individual needs.