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Optimal Ventilation SystemYour plants are optimally ventilated through temperaturecontrolled opening and closing Depending on the temperature the piston of the cylinder moves and opens or closes the window Premium Aluminum Stainless Steel BuildThe greenhouse accessories crafted with rustresistant aluminum and stainless steel for longlasting performance in humid conditions Supports up to 15 lbs 7 kg and opens windows up to 18 inches 45 cm Solar Heat SensitiveNon electric our window vent opener uses solar energy Operating between 15C to 25C 60F 77F the greenhouse vent opener works when the temperature exceeds 77F 25C solar vent opener will open while temperature drops to 59F 15C the greenhouse kit will shut down completely Easy InstallationAttach it directly to panels metal frames or wooden frames withwith the provided clamps and screws You can steplessly adjust the opening angle by turning the cylinder and thus achieve the right ventilation for your bed Ideal for Your Greenhouse Window Greenhouse window opener fits most common garden and greenhouses NotePlace the cylinder in a chilled environment for approximately 30 minutes Then take out it manually extend and retract the cylinder and reinstall it properly for use