It is made from rust-resistant 304-grade stainless steel

fits most louvres

28mm double pane insulated Low E glass in windows and doors

EVO3: Best for 2×4 grow tents and compact setups

5118 BTU’s

Alton | Thermofor Classic Roof Vent Auto Opener garden shed It is made from rust-resistantThe 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