Oneida's filters are rated at 99.97% efficiency at .3 microns, my Wynn nano filter is rated 99.9% efficiency at .5 microns and has over twice the surface area of the Oneida filter. Cheers, Don
They’re placed in front of HEPA filters, and designed to catch many particles before they reach the HEPA. With a much lower cost, and easy access, these filters can be changed more regularly. The HEPA filter is the last, and final stage of the filtration process, and the most important when looking to capture up to 99.97% of airborne particles. Classification and F 9 filter by EN 779 Classification. To meet current demands of clean air for specialized appli-cations, such as the military, the nuclear power industry, hos-pitals and the electronic industry, HEPA and ULPA filters are used. Based on the CEN EN 1822:1998 test method, a filter’s Sorted by: 2. A HEPA filter is defined as one which removes 99.97 of all particulates larger than 3 micrometers it does so by creating a pressure differential between it's input and output between which is placed a fine filter with as large a surface area to trap particulates as to fit its specification. Depends on your setup, Air extracted A HEPA filter captures 99.98% of particles. *Vs. cost of replacing filters on a competitor unit over 5-year period in 300 sq ft space. * EXCEEDS HEPA STANDARDS: Anti-Allergen* HEPA filter captures more micropollutants than HEPA standards require, trapping 99.98% of large, small, & micro-sized particles**