- Direct openers with rack, spindle or chain drive units
- Scissor drive systems
Depending on the size and weight of the window and its installation position, additional mechanical interlocks are used in combination with these mechanisms in order to maintain the security and weather ability of the window system.
Supporting regulations
- Powered windows, see ZH 1/94 and ZVEI publication "RWA aktuell No. 3"
- Maintenance of electric cable function, see specimen cable system directive (MLAR), which has now come into force in all states in Germany.