BIBISTORE Automatic Greenhouse Vent Opener Auto Solar Cold Frame Window Openers Agriculture Hothouse Roof Opening Kits Gardening Greenhouse Accessories-33 Lbs Lift Capacity,Two Springs

HIGH QUALITY&DURABLE-Made of high quality of galvanized steel.Durable and strong for long time use.. COMPLETE AUTOMATIC-This vent opener will automatically open and close your greenhouse window while the environment temperature changes , which will help you maintain the best growing temperature and prevents your greenhouse from overheating.. NON ELECTRIC-Use solar energy only,no batteries or electricity required.Economic and Eco-friendly.. TWO SPRINGS&HIGH LIFT CAPABILITY-Lifts vent weight up to 33 lbs (15 kg ),covers most of greenhouse windows.If you it is still not enough for your window,you could use two window openers together.. EASY TO INSTALL- Fit for most of aluminum&wooden frame greenhouse. Comes with a fitting accessory pack and a detailed manual for easy installation.