Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses vacuum pump for freeze dryer Extra Large (For XL Pro)

Extra Large (For XL Pro) - for Extra Large Harvest Right Pro Home Freeze Dryers

Heavy-duty extruded aluminum frame construction

Full-color

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

These versatile trays can be used as lids or trays

Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses vacuum pump for freeze dryer Extra Large (For XL Pro)The 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,