Automatically opens and closes the roof vent/window when temperature changes. The opener has a metal cylinder containing wax which expands when heated. This pushes a piston that opens the vent. As the temperature cools, the wax shrinks and a spring closes the vent and resets the piston. The opening and closing of the vent is gradual allowing just the right amount of air flow for cooling. Rion Automatic Roof Window Opener Fits Roof Windows/Vents for all Rion greenhouses.
- Assembled dimension: 11 in. W x 2 in. D x 2 in. H
- Solar powered, heat activated - start opening point: 54-59 F degrees
- Opens roof vent automatically as temperature warms for air circulation and heat relief, Closes when temperature cools
- Suitable for all types of greenhouses and easy to install
- Mechanic system - no electricity is needed