Features: 1Greenhouse window opener kit, adopts aluminum alloy material, with good durability and stability. 2When temperature changes automatically, it can automatically open and close to prevent the greenhouse from overheating. 3With springs and support rods, to provide extra protection against wind damage. 4It can be directly clamped or screwed on your greenhouse frame, easy to install and use. 5Maintain the optimal growth temperature in the greenhouse and provide a suitable growth environment. Condition: 100% Brand New Item Type: Window Opener Kit Material: Aluminum Alloy Color: Black Uses: Greenhouse, Household Bearing Weight: 14kg / 31lb Opening Force: 7kg / 15lb Closing Force: 0.5kg / 1lb Product Operating Temperature: 17-25 Maximum Opening Temperature: 30 Maximum Opening Distance: Approx. 45cm / 17.7in Weight: Approx. 570g / 20.1oz Window Opener Size: Approx. 31.5cm / 12.4in Cylinder Size: Approx. 34cm / 13.4in Package included: 1 x Accessory Kit (12Pcs) 1 x English Manual 1 x Window Opener 1 x Cylinder