Solar Powered Greenhouse Window Opener Kit - Automatic Ventilation System for Greenhouses, Non-Electric Home Garden Vent Opener | Perfect for DIY Greenhouse, Hydroponics & Indoor Gardening

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

Please make sure your greenhouse window can be opened freely by at least 45cm (18").

Perfect 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