New wider louvre vent that opens & closes automatically depending on weather conditions. For Eltham-D, Hampton-D & 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 degrees F (18 degrees C) & then close again as the temperature cools. The unit is ideal if you are out for the day & 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.