Item Name: Greenhouse Window Opener Automatic Window Opener Autovent Temperature Sensitive. Description100% Brand New and High QualityTemperature Range: 15-25 / 60-77Size: 33.5*1.5cmMaterial: Galvanized Sheet AluminumColour: BlackType: Greenhouse Window Opener CylinderQuantity: 1pcsWeight: Approx. 145gFeatures:This is a replacement cylinder for automatic window opener.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.Great for most greenhouse to open or close window automatically.When you receive this item in summer, you need to put the black bar into the refrigerator no less than 5 minutes to make the cylinder retracted fully before you assembly this product.Package Included:1 x Replacement Cylinder for Window Opener
