Large opening angle: replacement cylinder window opener maximum opening angle: 45 cm, maximum opening angle: approx. 30°, you can adjust the opening angle according to your needs. Automatic opening and closing of windows: garden sheds window opener can achieve optimal ventilation by temperature control, adjustable opening temperature range: 15°-25°. Easy to install: automatic greenhouse window opener can be clipped or screwed on to your greenhouse frame, easy to assemble, includes fixings and instructions (English language not guaranteed). Super load: window opener, maximum opening weight: 7 kg, without power supply or battery, completely temperature dependent. Fully automatic window opener: temperature controlled lifting capacity can maintain the optimal growth temperature, open or close the window when temperature changes, suitable for almost all greenhouses