One, determine the efficiency of air filters at all levels
The last level of air filter determines the cleanliness of the air, and the upstream pre-air filter plays a protective role, making the end filter life longer.
First determine the efficiency of the final filter according to the filtration requirements. The final filter is generally a high-efficiency air filter (HEPA), with a filtration efficiency of 95%@0.3u or more, and a high-efficiency air filter of 99.95%@0.3u ( H13 grade), this class of air filter has high filtration accuracy and corresponding cost is also relatively high, it is often necessary to add a pre-filter protection at the upper end of it. If the efficiency difference between the pre-filter and the high-efficiency air filter is too large, the previous stage will not be able to protect the latter stage. When the air filter is classified according to the European “G～F～H～U” efficiency specifications, a primary filter can be installed every 2 to 4 steps.
For example, the end high-efficiency air filter must be protected by a medium-efficiency air filter with an efficiency specification not lower than F8.
Second, choose a filter with a large filter area
Generally speaking, the larger the filtering area, the more dust it can hold, and the longer the service life of the filter. Large filter area, low air flow rate, low filter resistance, long filter life. The self-developed high-efficiency air filter has the characteristics of high filtration accuracy and low resistance, so it has a longer service life under the same filtration area.
Third, reasonable configuration of filter efficiency in various place
If the filter is dusty, the resistance will increase. When the resistance increases to a certain value, the filter will be scrapped. The resistance value corresponding to the scrap of the filter is called “end resistance”, and the choice of end resistance directly affects the service life of the filter.
The high-efficiency air filter has a self-cleaning function, and the material is not sticky, which greatly extends its service life
Fourth, cleaning and disposable
Most filters are disposable, they are either not cleanable, or economically not worth cleaning. The high-efficiency high-efficiency air filter is very particular about the occasion of use, and it is generally not cleaned unless it is thoroughly cleaned and the performance does not change after cleaning.
The traditional cleaning method is to add hand rubbing with water, so the filter material of the washable filter should be strong, such as the coarse fiber material of the G2-G4 efficiency filter, and the filter material of the F6 efficiency ventilation filter, the fiber is generally Between ∮0.5～∮5um, it is not strong and can’t stand rubbing. Therefore, most filters above F6 are disposable.
Post time: Jun-05-2020