Automatic Window Openers for Greenhouses, 2PCS Double Spring Temperature Controlled Automatic Window Opener for Greenhouse and Shed Lifting Force 15kg

【PREMIUM MATERIAL】The automatic window opener is made of aluminum alloy, maximum window opening: 45cm/17.7in. Maximum opening approximately: 30°. Maximum opening weight: 7kg / 15lb. Size: 38 x 9.5 x 9.5cm/14.96 x 3.74 x 3.74inch (Approx.) 【AVOID GREENHOUSE OVERHEATING】Great for your greenhouse window - opens and closes your greenhouse window. You don't need electricity in your greenhouse; the window opener will be very environmentally friendly and CO2 friendly throughout its lifespan. 【AUTOMATIC】Non-electric, uses solar energy, opens or closes the greenhouse vents as the temperature increases or decreases. As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating.【EASY TO INSTALL】Can be attached or screwed to your greenhouse frame; Please ensure that your greenhouse window can be opened freely by at least 45cm (18"). 【DOUBLE SPRING DESIGN】Compared with single spring vent, double spring window opener has stronger pushing force, stronger and much more durable. Features: Prevents overheating of the greenhouse. Ideal for your greenhouse window: opens and closes your greenhouse window. As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Non-electric, uses solar power, opens or closes greenhouse vents as temperatures rise or fall. Can be attached or screwed to the frame of your greenhouse.Specifications: Greenhouse Window Opener Kit Material: Aluminum Alloy Fully adjustable between 20 - 25°C (68 - 77°F) Maximum Window Opening: 45cm/18inch Maximum Opening Weight: 7kg/15lb Size: Approx. 38 x 9.5 x 5 cm / 15.0 x 3.7 x 2.0 inch Contents: 1 x Automatic Window Opener Kit Notes: Do not use this door opener anywhere the temperature will exceed 50°C (122°F) Please ensure that your greenhouse window can be opened freely by at least 45cm (18) Do not apply excessive loads by locking or covering the window Do not Do not disassemble the cylinder The door opener CANNOT stop manually Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.