Automatic Roof Vent Opener for the Palram Greenhouses

The Automatic Vent Opener automatically controls the temperature in all Palram greenhouses. As the air inside warms, the vent gradually opens to let in the right amount of airflow, then closes again once the optimal temperature is reached. The vent arm uses natural wax that expands with heat to push a piston and raise the window, then contracts as it cools, closing the vent with a spring. It operates entirely without electricity.