Fully Adjustable - Has an adjustable temperature range of between 15 and 25 degrees celcius.
Easy to Fit - Simply remove the existing window stays and attach the fittings into the pre-drilled holes on the vent framework with the screws supplied.
Fits Flush - Sits parallel to the greenhouse roof when closed so nothing hangs down to bang your head.
Durable - Finished with a black powder coating for a long life.
Designed specifically for the Rion range of greenhouses.
Learn moreHow it Works.
The stainless steel cylinder contains a temperature sensitive mineral wax that expands as the temperature rises. This increases the pressure inside and pushes out a steel pin that is connected to arm of the opener.This arm then opens the roof vent. As the temperature drops, the wax contracts and allows the vent to close.