Superior HEPA Box Functions
Source：http://www.hefilter.comStartTime：2015-08-04Hits：
1. Interception, where particles stand in line of flow in the air comes within one radius of a fiber and sticks to it.
2. Impaction, where larger particles can't avoid fibers by following the curving contours of the air stream and also compelled to embed in one of them straightly.
3. Diffusion, a kind of mechanisms that is a result of the collision with gas molecules by the smallest particles, especially those below 0.1 μm in diameter, which stopped or delayed in the path through the Filter. Because weak points of filter's performance still stand, the HEPA specifications employ the retention of these particles to classify the filter.
4. It is important to acknowledge that HEPA filters are not designed to filter out gasses and odor molecules.
As for uses in other fields, some vacuums also use HEPA Box to reduce particles returned to the air because of the HEPA box functions. Modern airliners use HEPA Box to reduce the spread of airborne pathogens in recirculate air. Some new model cars have cabin Air filters that look like HEPA Box but are not. The confusion is perpetuated by guides for changing car filters which misname the latter HEPA Box. The performance of the filter is difficult to evaluate, because they are not associated with MERV system, even though they usually yield MERV8 equivalent performance. HEPA Box functions are not only mentioned above. Moreover, HEPA box functions are superior to be applied to vehicles. Modern aircraft utilizing HEPA Box cartridge, in order to reduce air recirculation air propagation of pathogens. Some cars have cabin air filters that look like HEPA Box but are not.
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