Discuss the main filter life advantages and disadvantages?

The service life of the main filter depends on the quality of the pre-filter

Users often complain about the short life of filters for three main reasons:

First, the filter material area in the manufacturer of high efficiency air filter is too small or the dust capacity per unit area is too small;

Second, the filter efficiency of the prefilter is low; In addition, users’ expectations for the service life of HEPA filters are too high.

For the first reason, the use of large area filter significantly prolong the service life, it is best to take this into account in the design, after the completion of the project to transform the filter system to extend its service life is troublesome. In many projects, the user requires to reduce the space occupied by the air conditioning system as much as possible, or the user does not notice that the supplier uses the cheap filter with small filter area in the price reduction. Project acceptance filter can meet the requirements of air purification, but because the filter material area of the filter is too small, the service life of the filter will not be long.

For the second reason, the filtration efficiency of the pre-filter can be adjusted to keep the dust in the pre-filter. For example, the end filter is F7, the service life of the end filter is 3 months when using the G4 pre-filter, and the service life of the end filter is extended to half a year after using the pre-F5 filter. In the clean room, the value of the end-HEPA filter is not high, but the risk and overhead of replacing the HEPA air filter can be high, and replacing the prefilter does not need to stop production, so experienced owners will spend their attention and money on the prefilter.

For class 10,000 and class 100,000 clean workshop (non-uniform flow), F8 filter (colorimetric 95%) can be used for pre-filtration, so that the service life of the terminal high efficiency air filter can generally reach 5 years. In the past clean room air conditioning system design in China, the common configuration of the filter is: coarse effect → medium effect → high efficiency. At that time, the service life of the terminal HEPA filter was only 1 to 3 years.