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Details of air filter efficiency and class classification
Details of air filter efficiency and class classificationWhen the concentration of dust in the filtered gas is expressed in terms of weighted concentration, the efficiency is weighted; when expressed in terms of counted concentration, the efficiency is efficiency; when expressed in terms of other physical quantities, it is colorimetric efficiency or turbidity efficiency.We commonly use the counting efficiency expressed by the concentration of dust particles in the inlet and outlet airflow. I. Under the rated air volume, according to the national standard GB/T14295-93 "air filter" and GB13554-92 "high-efficiency air filter", the air filter filtration efficiency is expressed as follows. 1. primary filter, for ≥ 5 micron particles, filter efficiency 80>E ≥ 20, primary resistance ≤ 50Pa; 2. Medium efficiency filter, for ≥ 1 micron particles, filtration efficiency 70>E≥20, initial resistance ≤ 80Pa; 3. High efficiency filter, for ≥1 micron particles, filtration efficiency 99>E≥70, initial resistance ≤100Pa; 4. Sub-high efficiency filter, for ≥0.5 micron particles, filtration efficiency E≥95, initial resistance ≤120Pa; 5. High efficiency filter, for ≥0.5 micron particles, filtration efficiency E≥99.99, initial resistance ≤220Pa; 6. Ultra-high efficiency filter, for ≥ 0.1-micron particles, filtration efficiency E ≥ 99.999, initial resistance ≤ 280Pa. II. We all know that the development of our domestic air filter industry is relatively late, so many manufacturers use most of the equipment produced abroad, and they indicate that the efficiency of the method is different from the domestic method of expression, we will do the corresponding conversion between them to facilitate your understanding. 1. coarse filter is divided into four levels: G1 efficiency, to particle size ≥ 5.0μm, filtration efficiency E ≥ 20% (corresponding to the United States standard C1); G2 efficiency: to particle size ≥ 5.0μm, filtration efficiency 50>E ≥ 20% (corresponding to the United States standard C2 ~ C4); G3 efficiency: to particle size ≥ 5.0μm, filtration efficiency 70>E ≥ 50% (corresponding to the United States standard L5); G4 efficiency G4 efficiency: for particle size ≥5.0μm, filtration efficiency 90>E≥70% (corresponding to the American standard L6). 2. Medium efficiency filter is divided into two levels: F5 efficiency: for particle size ≥ 1.0μm, filtration efficiency 50>E≥30% (corresponding to the American standard M9, M10); F6 efficiency: for particle size ≥ 1.0μm, filtration efficiency 80>E≥50% (corresponding to the American standard M11, M12). 3. High and medium efficiency filters are divided into three levels: F7 efficiency: for particle size ≥ 1.0μm, filtration efficiency 99>E≥70% (corresponding to the American standard H13); F8 efficiency: for particle size ≥ 0.5μm, filtration efficiency 90>E≥75% (corresponding to the American standard H14); F9 efficiency: for particle size ≥ 0.5μm, filtration efficiency 99>E≥90% (corresponding to the American standard H15). 4. Sub-high efficiency filters are divided into two levels: H10 efficiency: for particle size ≥ 0.5μm, filtration efficiency 99>E≥95% (corresponding to the American standard H15); H11 efficiency: for particle size ≥ 0.5μm, filtration efficiency 99.9>E≥99% (corresponding to the American standard H16). 5. High-efficiency filter is divided into two levels: H13 efficiency: for particle size ≥ 0.5μm, filtration efficiency E≥99.9% (corresponding to the American standard H16); H14 efficiency: for particle size ≥ 0.5μm, filtration efficiency E≥99.99% (corresponding to the American standard H17). |
