Dekaim Greenhouse Window Openers,Greenhouse Window Opener Vent Autovent Solar Heat Sensitive Automatic Greenhouses Roof

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