Automatic Greenhouse Window Opener Roof Vent Autovent

Keep your greenhouse plants from frost and heat, because especially young sprouts and sensitive plants need a stable temperature.Made from sturdy aluminum and stainless steel, this automatic window opener is suitable for all conventional greenhouses. The windows are fully automatically opened and closed even in your absence.The construction is easy to assemble, using the clamping fittings with no drilling required.The cylinder reacts to the temperature changes; it closes the window automatically when it is cold and opens it when it is too warm. The resulted optimal air circulation prevents high humidity and typical greenhouse plant diseases.The window opener is powered via the built-in hydraulic cylinder that contains a special liquid. It expands or contracts depending on the temperature and makes the window open or close - no power or batteries needed. To ensure the longitivity of the opener, we recommend a frost-free storage of the cylinder over the winter months.