Function: 1. Greenhouse window opening kit, adopts aluminum alloy material, good durability and stability. 2. When the temperature changes automatically, it can open and close automatically to prevent the greenhouse from overheating. 3. With springs and support bars to provide extra protection against wind damage. 4. Can be directly clamped or bolted to the greenhouse frame, easy to install and operate. 5. Maintain the optimal growth temperature in the greenhouse and provide a suitable growing environment. Specification: Item Type: Window Opener Kit Material: aluminum alloy Black colour Applications: greenhouse, household Bearing weight: 14 kg / 31 lbs Opening force: 7kg / 15lb Closing force: 0.5 kg / 1 lb. Product operating temperature: 17-25 Maximum opening temperature: 30 Maximum opening distance: approx. 45 cm / 17.7 inch Weight: approx. 570g / 20.1oz Window Opener Size: Approx. 31.5 cm / 12.4 inch Cylinder Size: Approx. 34 cm / 13.4 inch Package list: 1 x Accessory Kit (12pcs) 1 x English manual 1 x window opener 1 x cylinder 1. 2.