For example a 20 micron filter has larger openings than a 5 micron filter. Bosch hepa premium cabin air filters provide filtration efficiency of 99 97 at 0 3 microns. Bosch cabin air filters are designed and tested to meet high efficiency particulate air hepa standards based on test standard astm d2986 and provides filtration efficiency of 99 97 at 0 3 microns.
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