- Filter filter material area is too small or unit capacity is too small dust capacity;
- Pre-filter filtration efficiency is low;
- The user of the filter life expectancy is too high.
For the first reason, switching to a multi-filter with a large filtration area can extend the service life, which should be taken into account in the initial design of the system. More projects, the user requires as much as possible to reduce the space occupied by air conditioning, or suppliers in order to achieve maximum profits, the use of filter area is small and cheap filters. Engineering acceptance, the filter can meet the requirements of air purification, but the filter life is relatively short.
Pre-filter filtration efficiency is low, you can adjust the efficiency of the pre-filter, can extend the life of the end filter. According to the test data: the end of the filter is F7, the use of G4 pre-filter end filter life is 3 months, switch to pre-F5 filter, F7 filter life can be extended to six months. In the clean room, the end efficiency value may not be high, but the risk of replacement filters and indirect costs will be high, for the pre-filter is not required to stop production, experienced owners will focus on the pre-filter.