New wider louvre vent that opens and closes automatically depending on weather conditions. For Eltham-D, Hampton-D and Exbury models. The most useful accessory you can buy for your Classic Mini greenhouse or Growhouse. Designed to automatically open as the temperature rises above 65°F (18°C) and then close again as the temperature cools. The unit is ideal if you are out for the day and the weather changes. It is also very useful for models that catch the early sun, as sunrise can be 5:30am in the Summer. Grease filled opener requires no electricity to operate. The louvre vent fits as standard to the left hand end. A right hand conversion kit is available which consists of perspex infill sheets.