Introduction to the different efficiencies of air filters

I. National standard GB/T14295-93 "air filter" and GB13554-92 "high-efficiency air filter" specified efficiency range

1. Coarse filter: filtering efficiency of ≥ 5 micron particles 80>E≥20, primary resistance ≤ 50Pa.

2. Medium efficiency filter: filtering efficiency of ≥1 micron particles 70>E≥20, initial resistance ≤80Pa.

3. High and medium efficiency filter: 99>E≥70 for ≥1 micron particles, initial resistance≤100Pa.

4. Sub-high efficiency filter: filtering efficiency E≥95 for ≥ 0.5-micron particles, initial resistance≤120Pa.

5. High-efficiency filter: filtering efficiency E≥99.99 for ≥ 0.5-micron particles, initial resistance≤220Pa.

6. Ultra-high efficiency filter: ≥ 0.1-micron particle filtration efficiency E ≥ 99.999, the initial resistance ≤ 280Pa.

II. The efficiency range of imported filters (European standard)

1. High-efficiency filters are divided into two levels (H12, H13):

H12 efficiency: the particle size ≥ 0.5μm filter efficiency E ≥ 99.9%.

H13 efficiency: filtering efficiency E≥99.99% for particle size ≥0.5μm.

2. Sub-high efficiency filters are divided into two levels (H10, H11):

H10 efficiency: for particle size ≥ 0.5μm filtration efficiency 99>E≥95%.

H11 efficiency: 99.9>E≥99% for particle size≥0.5μm.

3. Medium efficiency filter is divided into two levels (F5, F6):

F5 efficiency: the particle size ≥ 1.0μm filter efficiency 50>E≥30%.

F6 efficiency: for particle size ≥ 1.0μm filtration efficiency 80>E≥50%.

4. Coarse efficiency filters are divided into four levels (G1 - G4):

G1 efficiency: the particle size ≥ 5.0μm filter efficiency E ≥ 20%.

G2 efficiency: for particle size ≥ 5.0μm filtration efficiency 50>E≥20%.

G3 efficiency: for particle size ≥5.0μm filter efficiency 70>E≥50%.

G4 efficiency: for particle size ≥ 5.0μm filtration efficiency 90>E≥70%.