Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses quiet This pump was included with

This pump was included with every freeze dryer purchase in the past

A product showing signs of age (fabric that’s become thin or faded

waterproof IP65 approved

weight capacity ball bearing slides for easy access and two heavy-duty 4" x 2" casters that swivel and lock

Palram - Canopia | Automatic Roof Vent Opener for Palram - Canopia Greenhouses quiet This pump was included withThe 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,