This is a 2-way system that can open both from above and below.
The middle tube functions as a coil tubing, which is powered by a gear motor mounted on a rail system.
The upper central boom pipe is driven from a separately mounted gear motor and ensures the curtain is synchronized with the other gear motor.
The system can be regulated up to 450 cm.
You must reserve 140 cm of space for the gear motor and telescope carda. By exceeding max. length of 50 m, you can instead instead, use a center-mounted gearmotor, with telescopic cardan to both sides.
In this case the length can be up to 2 x 50 m, and here you have to travel 260 cm to the electrical system.