Domestic has a point of view, class of 100000 clean room can choose "the efficient filter (to acuity 0.5 microns particle filtration efficiency of 95% or higher) as the end of the filter, the reason is the high efficient power is cheap, small resistance.
In terms of the price of the filter, hepa filter of the same size on the market at present the hepa filter is 70% ~ 90% of the price, the high efficiency filter was not much cheaper than the high efficiency filter, when choosing the high efficiency filter, clean room air changes significantly increase, therefore, air conditioning system is larger, the number of air supply outlet (as well as the number of filter) to increase, the resulting increase in investment is far greater than high efficiency and the difference between the high efficiency filter.
In terms of resistance, the early and high efficiency filter resistance does some smaller than high efficiency filter. However, the size of the clean room at the beginning of terminal filter resistance is not so important, because no matter what kind of filters, the end resistance size are set at 500 ~ 600 pa. Filter design service life is long, for designers to consider is the filter close to the end resistance ventilation system can still work, when the resistance to the point at the beginning of the difference is irrelevant.
Hepa filter in the process of production, must carry on the line by performance testing, and for the high efficiency filter only a small amount of parking. Both appearance may be different, but the quality have obvious difference.