ITEM NAME:Roof Automatic Greenhouse Window Opener Vent Replacement Cylinder Temperatu A1W9 Roof Automatic Greenhouse Window Opener Vent Replacement Cylinder Temperatu A1W9 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. Replacement Greenhouse Window Opener Cylinder Temperature range 15 °- 25 °/60 °-77F Maximum opening weight 7kg/15lb Size:33cm This products need to be refrigerated before use it. Colour: Black material: metal Package content: 1* window opener
