The fourth generation of Pfannenberg's Filterfan, with free airflows ranging from 25 m3/h to 925 m3/h, uses a pleated fabric filter and a louvre profile to give a significantly higher airflow at IP55 than was achieved by the previous version at IP54; filter life is also three times longer. Water and dust pre-separation in the lamellas ensures that the great majority of water and dust never reach the filter mat, extending its lifetime and reducing the maintenance. The "Click and Fit" design avoids the need for fixings.
There are five sizes, with eight IP54 variants filtering to an improved G3 specification and seven IP55 versions capable of G4 level filtration.