Single Spring Window Opener-Galvanized Plate

Perfect for your greenhouse window opens and closes your greenhouse window as the temperature changes automatically, maintains the best growing temperatureand prevents your greenhouse from overheating
Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
Including fittings & installation manual
Can be clamped onto or screwed onto your greenhouse frame

Important notice:
Do not use this opener anywhere the temperature will exceed 50° (122F)
Please ensure your greenhouse window can be opened freely by at least 45cm (18″)
Do not apply excessive loads by locking or covering window
Do not dismantle the cylinder,The opener CANNOT stop by manual