Alton | Thermofor Classic Roof Vent Auto Opener Freeze Dryer Recipe Book The heavy duty interior columns

The heavy duty interior columns allow you to mount shelves and garden tools

narrow walkways or in a garage

parking garages

Select the correct shelf length for your greenhouse configuration

Alton | Thermofor Classic Roof Vent Auto Opener Freeze Dryer Recipe Book The heavy duty interior columnsThe Thermofor Classic Roof Auto Opener is a simple, reliable way to keep your Alton greenhouse properly ventilated, without any manual effort. Designed specifically for Alton greenhouse roof vents, it uses a heat sensitive, oil filled piston that automatically opens the vent as temperatures rise, helping create a healthier growing environment for your plants. As the greenhouse warms, the piston expands and gently lifts the vent. When temperatures