Canopia by Palram Automatic Roof Vent Opener was designed to automatically control the temperature in all Canopia by Palram Greenhouses. As the air inside the greenhouse warms, the vent gradually opens to allow the correct amount of airflow into the greenhouse and closes when the optimal temperature is reached. The Canopia by Palram vent arm was designed with the use of natural wax that expand to push a piston, which raises the window, as the air gets warmer than contracts as it cools, closing with the use of a spring. This automatic vent opener operates without the use of electricity.Note: This product may require up to 2 additional days for order processing prior to shipping

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