Greenhouse Window Opener Vent Autovent Solar Garden House Heat Sensitive Automatic Greenhouses Roof

?HIGH QUALITY?All parts resistant. Spring controlled - Resists wind damage when opening and closing. When temperature above 25¡ã/77¡ãF, the window opener will keep opening.Fully open temperature at 30¡ã (86¡ãF) or above; once temperature drop to about 15¡ã/59¡ãF, the window opener will totaly close. ?NON ELECTRIC?Uses solar energy, open or close the greenhouse vents as temperature rises or drops and clamps to greenhouse bars - no drilling needed quality construction. ?APPLICATION?Maximum window opening approximately 45cm/18'', depending on adjustment and load. Window roof vent opener Suitable for greenhouse window up to 7kg (if more than 7kg, we recommend you to use two window opener). ?AUTOMATIC?This opener will automatically open and close your greenhouse window, as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. ?NOTICE?Do not apply excessive loads by locking or covering window.The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50¡ã