Ventilation flaps arranged in a line can be operated by a single drive unit. One or more racks are connected by the drive unit to a 1“ tubular connection shaft compliant with DIN 2440. The racks pivot with the flap.
Alternatively with scissor gear unit SGS. For use when rack cannot be located in room, and for low load ratings (e.g. conservatories).
Ventilation systems with lowering flaps or tarpaulin can be operated with one drive unit. An EWA power drive or an HWA manual drive can be used.