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

Material: Aluminum Alloy. Fully adjustable between 20 - 25 ° C (68 - 77 ° F). 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. Easy to use. Can be clamped onto or screwed onto your greenhouse frame.