Suitable for Most Greenhouses--This opener will automatically open and shut your greenhouse window to maintain the best growing temperature and preventing your greenhouse from overheating.
Quality Construction--Reliable, quality built anodised aluminium automatic window opener for greenhouses.
Working Conditions--Start to open - 15°c - 25°c (60°-77F); Fully open temperature 35° (19f) or above; Fully open distance 45cm (18")
Environmental friendly--Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops
Important notice: Do not use this opener anywhere the temperature will exceed 45° (122F)