Alton | Thermofor Roof Vent Opener Piston Replacement leanto shed bolts and hinges made of

bolts and hinges made of stainless steel

9% of harmful UV rays and crystal clear virtually unbreakable 0

this thoughtfully engineered kit combines smart design

Sturdy and durable aluminum profiles - anthracite powder coated gray finish

Does this greenhouse include automatic vent openers

Alton | Thermofor Roof Vent Opener Piston Replacement leanto shed bolts and hinges made ofThe Thermofor Long Piston Replacement is a direct replacement cylinder designed for Thermofor automatic roof vent openers used in Alton greenhouses. If your current opener is no longer responding properly to temperature changes, replacing the piston is a simple way to restore reliable, automatic ventilation. This heat sensitive cylinder contains a wax core that expands as temperatures rise and contracts as they cool, driving the vent to open and close