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

【PREMIUM QUALITY MATERIAL】The automatic window opener is made of aluminum alloy. Maximum window opening: 45cm/17.7 inches. Maximum opening angle: approximately 30°. Maximum opening weight: 7kg/15lb. Size: 38x9.5x9.5cm/14.96x3.74x3.74 inches (approximately) 【PREVENT GREENHOUSE OVERHEATING】Ideal for your greenhouse window - opens and closes your greenhouse window. You don't need electricity in your greenhouse; the window opener will be very eco-friendly and CO2-friendly throughout its lifespan. 【AUTOMATIC】Non-electric, uses solar power, opens or closes greenhouse vents as the temperature rises or falls. As the temperature changes automatically, it maintains the best growth temperature and prevents your greenhouse from overheating. 【EASY TO INSTALL】Can be screwed or fixed to your greenhouse frame; please ensure your greenhouse window can be opened freely at least 45cm (18"). 【DOUBLE SPRING DESIGN】Compared to a single spring vent, the double spring vent opener has a stronger, sturdier, and much more durable push force. Features: Prevents greenhouse overheating. Ideal for your greenhouse window: opens and closes your greenhouse window. As the temperature changes automatically, it maintains the best growth temperature and prevents your greenhouse from overheating. Non-electric, uses solar energy, opens or closes the greenhouse vents when the temperature rises or falls. Can be fixed or screwed onto your greenhouse frame. Specifications: Greenhouse Window Opener Kit Material: Aluminum alloy Fully adjustable between 20-25°C (68-77°F) Maximum window opening: 45cm/18 inches Maximum weight when open: 7kg/15lb Size: approx. 38x9.5x5cm/15.0x3.7x2.0 inches Contents: 1x Automatic Window Opener Kit Notes: Do not use this opener anywhere the temperature will exceed 50°C (122°F). Please ensure your greenhouse window can be opened freely at least 45cm (18 inches). Do not apply excessive force when locking or covering the window. Do not disassemble the cylinder. The opener CANNOT be stopped manually. Monitors are not calibrated the same way, the color of the item shown in the photos may be slightly different from the actual object. Please take the actual product as standard.