Underneath the rooftop, covering the length of the roof, there is a drive tube mounted with a tooth rack. The racks are attached to the greenhouse cover by means of window brackets which pushes the windows upwards.
The drive tube is driven by a worm gearbox (W series). These worm gearboxes are, on their turn, driven by one fast moving motor gear reducer.
Due to the mechanical coupling between the main drive (T-series) and the worm gearboxes (W-series) a drive system originates which has low installed power.