Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses vacuum pump for freeze dryer These versatile trays can be

These versatile trays can be used as lids or trays

Heavy-duty extruded aluminum frame construction

For most of us

Designed with UV-protected pp plastic that is BPA- free - will not rot

It is ETL listed and IP65 approved

Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses vacuum pump for freeze dryer These versatile trays can beThe Automatic Vent Opener was designed to automatically control the temperature in all Palram Canopia 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 vent arm was designed with the use of natural wax that expands to push a piston, which raises the window, as the air gets warmer then contracts as it cools,