Greenhouse Vent Automatic Opener，Solar Heat Sensitive Window Opener，Double Spring Aluminum Ventilation Opener

[Automatic] A mechanical system activated by heat that requires no batteries or electricity and uses solar energy to open or close the greenhouse vents as the temperature rises or falls. [Temperature Control] An automatic temperature control sensor cylinder that allows the roof vents to open and close at the proper time to ensure adequate airflow. [High Quality] Conservatory window openers are made of aluminum and stainless steel, durable and weather resistant for long term use. [Efficient] The automatic vent opener opens and closes greenhouse windows quickly and can be clamped or screwed to your greenhouse frame.