2PCS Auto Roof Vent Opener Automatic Greenhouse Window Opener for Ventilation Solar Heat Sensitive Auto Vent Kit Agriculture Gardening Tools Automatic Greenhouses Supplies (Single Spring Lifts 15 Lbs)

?????Temperature-Sensitive Ventilation?Our automatic window opener will automatically open and shut your greenhouse window to maintain the best growing temperature and preventing your greenhouse from overheating, efficiently regulating your greenhouse's internal climate. ?????Premium Material?Featuring an aluminum spray-painted cylinder, the solar window opener is built to last and withstand harsh weather conditions. Aluminum frame looks more lustrous, durable and rust-proof. Stainless steel accessories would guarantees long-lasting performance. ?????Wide Temperature Range?Operating between 15°C to 25°C (60°F - 77°F), the opener adapts to various weather conditions. It achieves a full opening at temperatures above 38°C (100°F) and offers a maximum vent distance of 45cm (18"). Do not use this opener anywhere the temperature will exceed 60° (140 f). ?????Energy-Efficient & Eco-Friendly?The greenhouse window opener does not consume any power, no batteries or electrical power needed, which is energy-saving and environmentally friendly. ?????Ideal for Your Greenhouse Window?You will receive 2pcs of automatic greenhouse vent openers, enough quantity to meet your needs and replacements. Each opener comes with a fitting accessory pack and a detailed manual for easy installation.