The roof of a max-air greenhouse can be opened completely. This type of greenhouse is also called Open Roof or Cabriolet greenhouse. From the gutter both sides of the roof hinge vertically. As normal Venlo greenhouses all installations and systems can be installed in max-air greenhouses. The roof can be covered with glass as well as with synthetic materials like polycarbonate sheets. Choice for covering depends on the wanted UV-level. Max-air greenhouses are particularly used for crops that need to be exposed to outside weather conditions.