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WebApr 10, 2024 · Greenhouse Automatic Window Opener Solar Heat Sensitive Autovent Vent Opener. $21.99. Free shipping. Replacement Cylinder For Greenhouse Window Opener 17°C - 25°C. $16.15 + $20.56 shipping. Automatic Vent Window Opener Kit Solar Heat Sensitive Auto Vent for Greenhouses. $21.99. WebJul 10, 2024 · Step 1. Place the opener in the centre of a window vent and mark the position of the holes on the window frame and greenhouse frame. If you have a metal … WebAutomatic Greenhouse Window Opener Autovent . £19.99 £16.66. View Product. Add to Cart. Add to Compare. Replacement Cylinder For Greenhouse Window Opener . £10.99 £9.16. View Product. Add to Cart. Add to Compare. View as Grid List. 5 Items . Show. per page. Sort By. Set Descending Direction. camping riegsee