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Optimal ventilation: your plants are optimally ventilated by temperature-controlled opening and closing. Depending on the temperature, the piston of the cylinder moves and opens or closes the window. High Quality Material The window opener is made of high quality aluminum alloy, durable and rustproof, which makes it have a longer service life. Maximum opening approx. 30° Maximum opening weight: 7 kg. SOLAR HEAT SENSITIVE Non electric, our window vent opener uses solar energy. The automatically set temperature is 15 to 25 °C. When the temperature exceeds 25 degrees, the window regulator remains open. The temperature drops to 15-18 degrees Celsius and the opener closes completely. CUSTOMIZABLE - Can be quickly and easily installed for the windows of ordinary garden and greenhouses. You can freely adjust the opening angle by rotating the cylinder and thus achieve the right ventilation for your bed. IDEAL FOR YOUR GREENHOUSE WINDOW The greenhouse window opener can be clamped or screwed onto your greenhouse frame, opens and closes your greenhouse window. › See more product details