MFP filter test rigs from Palas® have already proved themselves many times worldwide in practical applications in development and quality control. The MFP Nano plus 4000 is specially designed for the precise determination of the separation efficiency of HEPA and ULPA filter media in accordance with DIN EN 1822-3 and ISO 29463-3. In the form of the U-SMPS, a modern and powerful nanoparticle measuring device with a measurement range from 5 nm to 1 µm is used for particle size and quantity analysis. The separation efficiency at a specific size is measured in real-time with the MFP Nano plus 4000 and a UF-CPC condensation particle counter in both the raw and clean gas.