Viccilley Window Opener Kit - Greenhouse Window Opener Vent Autovent Solar Heat Sensitive Automatic Greenhouses Roof

☛As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. ☛Ideal for your greenhouse window--opens and closes your greenhouse window. ☛Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. ☛Prevent greenhouse overheating.