Alton | Thermofor Classic Roof Vent Auto Opener LED Lighting or organizing tools

or organizing tools

Buyers focused on entry-level or budget greenhouse options

Product Length (IN): 18

more open layout

Alton | Thermofor Classic Roof Vent Auto Opener LED Lighting or organizing toolsThe 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