Risegun Greenhouse Window Opener,15 lb Automatic Window Opener Solar Heat Sensitive Greenhouse Autovent Vent Opener Hothouse Vent Openers Auto Vent Kit

【Durable Material】Aluminium and stainless steel material, No worry corrosion. 【Automatic Adjustment】As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. 【Environmental Protection and Energy Saving】Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. 【Easy to Install】Easy to fit onto your Greenhouse vent or window using supplied screws and clamps or your own fasteners into pre-punched holes.