Description The KEMPER original storage filter is suitable for the MaxiFil (mobile and stationary), SmartFil and WallMaster units. The XXL filter surface of 42 m² of the roll filter offers the highest welding fume separation with the lowest energy consumption. The filter class is E12 with a separation efficiency ≥ 99.9 %. Important note: When using original filters, you are on the safer side and act in a legally compliant manner, as this means that the IFA W3 certification and the warranty of your unit remain intact and valid.