Pinion & Rack Window Ventilation:
This system is the most common way of window driven in the large multi span greenhouse. When working, the shade system will be folded and unfolded by the movement of the pinion & rack system, which is driven by the gear motor.
Roll up Ventilation Ventilation:
This system is easy to install and operate; it can provide substantial airflow throughout the structure. It is natural ventilation for poly film green- house. It can be driven by manual and motor.