Alton | Thermofor Roof Vent Opener Piston Replacement Partyhouse or small vegetable plants

or small vegetable plants

Crystal-clear 4 mm high-impact acrylic panel

Heavy duty

Does this greenhouse include automatic vent openers

for additional strength and rafter stiffness

Alton | Thermofor Roof Vent Opener Piston Replacement Partyhouse or small vegetable plantsThe 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