Ouitble Automatic Window Opener Solar Heat Sensitive Auto Thermo Roof Vent Opener for Greenhouse Agricultural Vent Autovent Kit, Lifts 15 Lbs

【Anti Overheating】Automatic Window Opener can prevent greenhouse overheating. 【Easy to Install】Vent Opener for grennhouse can be clamped onto or screwed onto your greenhouse frame. 【Solar Sensitive】As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. 【Automatic Vent Opener】Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.