Ventilation flaps arranged on a surface area can be operated with a single drive unit on each side. UBL gear units with C-sections are secured on the gutters between two rail mountings. The gear units are connected to the drive unit by a connecting shaft (1“ tube DIN 2440).
The racks move in the C-section and pull the pivot-action push-pull rod to which the push bars on the flap is secured. It is these push bars that actuate the flaps.