Wiwir Solar Heat Sensitive Automatic Greenhouse Vent Opener Auto Vent Kit Gardening Tools for Greenhouses Roof Ventilation (Single Spring Vent Opener)
- 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).
Details: This very smart autovent uses energy from the sun and surrounding air. The autovents strong metal tube contains a mineral wax which expands with heat. This pushes a piston which opens the vent via a balanced linkage. As the temperature rasises, the vent will open. As the temperature drops, the wax shrinks and a strong stainless steel spring closes the vent and resets the piston. Things to remember: -Do not use this opener anywhere the temperature will exceed 60° (140f) -Please ensure your greenhouse window can be opened freely by at least 45cm (18") -Get the very best from your greenhouse plants and veggies - don't leave it to chance! Package included: - Automatic window opener x 1 - English manual x 1
Package Dimensions: 14.6 x 3.8 x 2.0 inches