ALANES Automatic Greenhouse Window Opener Solar Heat Sensitive Auto Hothouse Vent Openers Roof Opening Tools for Sunlight Room Greenhouse Accessories

When temperature above 25°/77°F, the window opener will keep opening.Fully open temperature at 30° (86°F) or above; once temperature drop to about 15°/59°F, the window opener will totaly close. Uses solar energy, open or close the greenhouse vents as temperature rises or drops This opener will automatically open and close your greenhouse window, as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Do not apply excessive loads by locking or covering window.The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50°