TOPINCN Automatic Greenhouse Window Opener, Automatic Greenhouse Vent Opener Easy to Install Greenhouse Accessories for Garden Greenhouse Roof
- 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.
- As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating.
- Perfect for your greenhouse window‑‑opens and closes your greenhouse window.
- Please make sure your greenhouse window can be opened freely by at least 45cm (18")..