Automatic Greenhouse Window Opener Kit Single and Double Spring Options Keep greenhouse temperature stable without electricity. This automatic window opener uses solaractivated thermal power to open and close vents as temperature changes, helping prevent overheating and maintain suitable growing conditions. Key benefits Automatic temperature control: Opens and closes vents as temperature rises or falls, maintaining a consistent growing environment. Non electric operation: Uses solar heat buildup for activation, so no wiring or external power is required. Easy to install: Can be clamped onto or screwed to the greenhouse frame to suit different installations. Durable construction: Aluminum alloy components and precision testing ensure reliable performance under normal use. Adjustable performance: Temperature activation and opening angle can be tuned to match window size and crop needs. Features and functions Acts as an automatic ventilator for greenhouse windows to reduce manual work and reduce the risk of overheating. Single and double spring kit options to match different window sizes and opening requirements. Fully adjustable opening temperature and stroke to achieve desired ventilation behavior. Suitable for windows that can open at least 45 cm (18 inch) and with a maximum opening weight up to 7 kg (15 lb). Specifications Single Spring Kit Material: Aluminum alloy Adjustable activation temperature: 20 25 C (68 77 F) Maximum window opening: 45 cm / 18 inch Maximum opening weight: 7 kg / 15 lb Size: Approx. 38 x 9.5 x 5 cm / 15.0 x 3.7 x 2.0 inch Double Spring Kit Material: Aluminum alloy Adjustable activation temperature: 15 25 C (60 77 F) Maximum window opening: 45 cm / 18 inch Maximum opening angle: Up to about 30 degrees depending on adjustment and load Maximum opening weight: 7 kg / 15 lb Size: Approx. 38 x 9.5 x 9.5 cm / 14.96 x 3.74 x 3.74 inch Package contents 1 x Automatic Window Opener Kit (Single or Double Spring kit, according to selection) Important notes and installation guidelines Do not use this opener where ambient temperature will exceed 50 C (122 F). Ensure your greenhouse window can open by at least 45 cm (18 inch) before installation. Do not apply excessive loads by locking or covering the window; this may damage the unit. Do not dismantle the cylinder. Operation cannot be manually stopped once activated. Product color in photos may vary slightly from the real item due to monitor differences. Item design has been upgraded; the 11th part shown in earlier manuals is not included. Please follow the actual parts supplied. Materials and workmanship are of and products are precision tested before leaving the factory. Check window size and load to confirm compatibility with the maximum opening and weight specifications. Practical applications Hobby greenhouse ventilation: Automate venting for small backyard greenhouses to keep plants within target temperature ranges without daily manual checks. Seedling and propagation benches: Maintain stable temperatures in propagation spaces where consistent airflow is important. Cold frames and small poly tunnels: Provide automatic venting during warm periods to reduce heat stress on young plants. This kit provides a mechanical, lowmaintenance solution to automate greenhouse ventilation. Choose the single or double spring option based on your window size, required opening angle, and adjustable temperature range.