The Palram Canopia Rion Automatic Side Louvre Window Opener helps optimise the temperature in any Palram Canopia Rion Greenhouse with a side louvre window.There’s no need to use electricity, or even be on hand, to operate this clever greenhouse auto louvre opener, which uses a piston and spring to automatically open and close any Palram Canopia Rion side louvre window, according to the temperature inside the greenhouse.Designed using wax, which contracts and expands as the temperature changes, the heat-activated arm starts opening the window when the temperature reaches 12-15C, and then gradually closes it as the temperature drops.Backed by a 1-year warranty, this greenhouse automatic window opener is very easy to instal and compatible with all Palram Canopia Rion Greenhouses with side louvre windows.Delivery is free to most UK addresses.Uses a piston and spring to open and close the side louvre windowNo electricity requiredAutomatically opens when the temperature reaches 12-15CCloses the louvre window as the temperature dropsVery easy to instal1-year warrantyCompatible with all Palram Canopia Rion Greenhouses with side louvre windowsFree delivery to most UK addresses