These spaces utilize the PGT EzeBreeze system. A great solution for more "three season" use at a very palatable price point. These spaces remain clean in the pollen season, dry in the rain and when we utilize our Infratech heaters they can be warm in the winter. With over 10K panels we have installed in the last 10 years we are incredibly versed and proficient with the product. We are also a local EzeBreeze dealer!!