V bank filters, are the pre-filters before HEPA filters, filter particles size 0.5um with efficiency from 75-99%, filter media can be polyester or glass fiber. V bank filters are the most important part of cleanroom ventilation systems when the cleanliness level is 100 or 10. To enlarge the service life of HEPA filters, ULPA filters, V bank filters need to remove most of the 0.5um particles, the role and function are the same as pocket filters, but v bank filters offer more stable performance.