High performance air filter-Primary performance air filter-cabin air filter's filtration efficiency method
When the filtered dust concentration in the gas expressed in weight concentration, efficiency is for weighing efficiency; When expressed as a count concentration, the efficiency is for effceting efficiency; For relative to other physical quantities represented, the colorimetric turbidity is color efficiency or turbidity efficiency. Mostly we use the counting efficiency of the dust concentration in the air which pass to import or export the filters.    
  

1.Under the rated air flow, according to the national standard GB/T14295-93 of the air filters and GB13554-92 the provisions of the high efficiency particulate air filters, HEPA filter-filter-cabin air filter's efficiency rates are as follows:

Primary performance air filter, for ≥ 5 μm particles,filtering performance 80>E≥20, Early resistance ≤50Pa

Middle performance air filter,for ≥ 1 μm particles,filtering performance 70>E≥20, Early resistance ≤80Pa

High-middle performance air filter, for ≥ 1 μm particles,filtering performance 99>E≥70, Early resistance ≤100Pa

Sub-high performance air filter, for ≥ 0.5 μm particles,filtering performance E≥95, Early resistance ≤120Pa

High performance air filter, for ≥ 0.5 μm particles,filtering performance E≥99.99, Early resistance ≤220Pa

Ultra high performance air filter, for ≥ 0.5 μm particles,filtering performance E≥99.999, Early resistance ≤280Pa

2. Domestic air filter develop late. Many enterprise used the filters which are produced by foreign company before, so there are many enterprise using importing filters until now, and their efficiency of method is different form domestic of efficient who is high performance air fitler -early effect air filter –cabin air filter, for easy comparison, List of conversion between them as follows:

Divided According to the European standard:
Low performance air filter can divided into four grades (G1~~G4):

G1 performance air filter, to Particle size≥5.0μm,filtering performance E≥20% (Comparing to USA standard C1)                                        

G2 performance air filter, to Particle size≥5.0μm, filtering performance 50>E≥20% (Comparing to USA standard C2~C4)
G3 performance air filter, to Particle size≥5.0μm, filtering performance 70>E≥50%( Comparing to USA standard L5)                                 

G4 performance air filter, to Particle size≥5.0μm, filtering performance 90>E≥70% (Comparing to USA standard L6)

Middle performance air filter can divided into two grades (F5~~F6):


F5 performance, to Particle size≥1.0μm,filtering performance 50>E≥30%( Comparing to USA standard M9\ M10)                         

F6 performance,to Particle size≥1.0μm, filtering performance 80>E≥50% (Comparing to USA standard M11\M12)

High-middle performance air filter can divided into three grades(F7~~F9):

F7 performance,to Particle size≥1.0μm, filtering performance 99>E≥70% (Comparing to USA standard H13)                                

F8 performance,to Particle size≥0.5μm, filtering performance 90>E≥75% (Comparing to USA standard H14)

F9 performance,to Particle size≥0.5μm, filtering performance 99>E≥90% (Comparing to USA standard H15)

Sub-high performance air filter can divided into two grades (H10\H11):

H10 performance ,to Particle size≥0.5μm, filtering performance 99>E≥95%( Comparing to USA standard H15)                             

H11 performance ,to Particle size≥0.5μm,SEO, filtering performance 99.9>E≥99% (Comparing to USA standard H16)

Highperformance air filter can divided into two grades(H13\H14):

H13 performance ,to Particle size≥0.5μm, filtering performance E≥99.9%( Comparing to USA standard H16