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Filter grade of air filter
Filter grade of air filter
In the different types and types of air filters, it is sometimes difficult to distinguish between the filtration efficiency of high-efficiency air filters, primary filters, and air-conditioning filters.
When the dust concentration in the filtered gas is expressed by the weight concentration, the efficiency is the weight efficiency; when the count concentration is expressed, the efficiency is the efficiency efficiency; when other physical quantities are used as relative expressions, it is the colorimetric efficiency or Turbidity efficiency, etc. The most commonly used method of expression is the counting efficiency expressed by the concentration of dust particles in the airflow at the inlet and outlet of the filter.
According to Chinese standards:
1. Under the rated air volume, according to the national standard GB/T14295-93 "Air Filter" and GB13554-92 "High Efficiency Air Filter", the efficiency of high efficiency air filter-primary effect filter-air conditioning filter is expressed as the method rate The scope is as follows:
Primary efficiency filter, for particles ≥5 microns, filtration efficiency 80＞E≥20, initial resistance ≤50Pa Medium efficiency filter, for particles ≥1 microns, filtration efficiency 70＞E≥20, initial resistance ≤80Pa
High efficiency filter, for ≥1 micron particles, filtration efficiency 99＞E≥70, initial resistance ≤100Pa Sub-high efficiency filter, for ≥0.5 micron particles, filtration efficiency E≥95, initial resistance ≤120Pa
High efficiency filter, for ≥0.5 micron particles, filtration efficiency E≥99.99, initial resistance ≤220Pa Ultra high efficiency filter, for ≥0.1 micron particles, filtration efficiency E≥99.999, initial resistance ≤280Pa
2. The development of the domestic air filter industry is relatively late. In the past, many companies used foreign-produced air filters, so many companies still choose imported filters, and they express the efficiency of the method and the domestic high efficiency. The air filter-primary filter-air conditioning filter have different expressions of filtration efficiency. For the sake of comparison, the conversion relationship between them is listed as follows:
According to European standards:
The coarse filter is divided into four levels (G1~~G4):
G1 efficiency For particle size ≥5.0μm, filtration efficiency E≥20% (corresponding to American standard C1) G2 efficiency For particle size ≥5.0μm, filtration efficiency 50>E≥20% (corresponding to American standard C2~C4)
G3 efficiency For particle size ≥5.0μm, filtration efficiency 70＞E≥50% (corresponding to American standard L5) G4 efficiency For particle size ≥5.0μm, filtration efficiency 90＞E≥70% (corresponding to American standard L6)
The medium-efficiency filter is divided into two levels (F5~~F6):
F5 efficiency For particle size ≥1.0μm, filtration efficiency 50＞E≥30% (corresponding to American standard M9, M10) F6 efficiency For particle size ≥1.0μm, filtration efficiency 80＞E≥50% (corresponding to American standard M11, M12)
High and medium efficiency filters are divided into three levels (F7~~F9):
F7 efficiency For particle size ≥1.0μm, filtration efficiency 99＞E≥70% (corresponding to American standard H13) F8 efficiency For particle size ≥0.5μm, filtration efficiency 90＞E≥75% (corresponding to American standard H14)
F9 efficiency For particle size ≥0.5μm, filtration efficiency 99＞E≥90% (corresponding to American standard H15)
The sub-high efficiency filter is divided into two levels (H10, H11):
H10 efficiency For particle size ≥0.5μm, filtration efficiency 99＞E≥95% (corresponding to American standard H15) H11 efficiency For particle size ≥0.5μm, SEO, filtration efficiency 99.9＞E≥99% (corresponding to American standard H16)
The high efficiency filter is divided into two levels (H13, H14):
H13 efficiency For particle size ≥0.5μm, filtration efficiency E≥99.9% (corresponding to U.S. standard H16 H14 efficiency For particle size ≥0.5μm, filtration efficiency E≥99.99% (corresponding to U.S. standard H17)
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