This is a 2-pipe winding system, where the bottom serves as a winding pipe.
System is used for openings with a height up to 305 cm.
When using the manual hand crank or gear motor system, you must reserve 140 cm space for telescopic cardan and hand crank / gear motor.
Possible lengths in relation to heights, see the table
If a specified height exceeds the maximum possible length, instead, you can place a gear motor, with telescopic cardan to both sides.
In this case, you must reserve 260 cm for the electrical system.