Fictory Solar Heat Sensitive Greenhouse Window Opener Vent Autovent Solar Heat Sensitive Automatic Greenhouses Roof Auto Thermo for Window

Greenhouse Vent Autovent 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. Solar Heat Sensitive Auto Thermo Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Solar Heat Sensitive Can be clamped onto or screwed onto your greenhouse frame.