Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent Opener Standard - Lifts 15 Lbs

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. No batteries or electrical power needed. The liquid-filled cylinders expand as temperature increases. Do not apply excessive loads by locking or covering window. The opener CANNOT stop by manual. Item Specifications: Maximum window opening 45cm Maximum opening about 30°, depending on adjustment and load Maximum opening weight 7kg/15lb Adjustable open temperature range 15°- 25°/60°-77F Package： 1 x Automatic window opener 100% brand new and high quality. Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Simply opens and closes when the temperature changes. Maximum opening : about 30°, depending on adjustment and load . /Maximum window opening : 45cm. Suitable for most greenhouses.