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| CLASSIFICATION | Arrestance or Dust Spot Efficiency | US ASHRAE 52.2 | European Union EN779 Class | Typical Controlled Contaminant | Application | |
| PRE Filter (G Class) | AFI <65 % | MERV 1 | G1 | Am< 65% | Particle bigger than 10.0µm （Pollen） （Spanish moss） （Dust mites） （Sanding dust） （Spray paint dust） （Textile fibers） | Gross filter, domestic and commercial |
| AFI 65%-70% | MERV 2 | G2 | 65%≦Am< 80% | |||
| AFI 70%-75% | MERV 3 | |||||
| AFI 75%-80% | MERV 4 | |||||
| AFI 80%-85% | MERV 5 | G3 | 80%≦Am<90% | Particle size within 3.0µm-10.0µm (Mold） (Spores） (Hair spray） (Cement dust） (Snuff） (Powdered milk） | Commercial, industrial, paint shop | |
| AFI 85%-90% | MERV 6 | |||||
| NBS 25%-30% | MERV 7 | G4 | 90%≦Am | |||
| NBS 30%-35% | MERV 8 | |||||
| MEDIUM Filter (F Class) | NBS 40%-45% | MERV 9 | F5 | 40%≦Em< 60% | Particle Size within 1.0µm-3.0µm (Lead dust） (Milled flour） (Coal dust） (Auto emissions） (Nebulizer drop） (Welding fumes） | IAQ concerned commercial & industrial, medical |
| NBS 50%-55% | MERV 10 | |||||
| NBS 60%-65% | MERV 11 | F6 | 60%≦Em< 80% | |||
| NBS 70%-75% | MERV 12 | |||||
| NBS 80%-85% | MERV 13 | F7 | 80%≦Em< 90% | Particle size within 0.3µm-1.0µm (All bacteria） (cooking oil） (Most smoke） (Copier toner） (Most face powder） (Most paint pigments） | IAQ concerned commercial, industrial, medical, food etc | |
| NBS 90%-95% | MERV 14 | F8 | 90%≦Em< 95% | |||
| NBS>95% | MERV 15 | F9 | 95%≦Em | |||
| MERV 16 | ||||||
| CLASSIFICATION | Mean Fractional Efficiency | IEST RP-CC001.3 | European Union EN1822 Class | Typical Controlled Contaminant | Application | |
| HEPA Filter (H Class) | ≧95% at 0.3µm | n/a | H10 | ≧85% at MPPS | Particle size bigger than 0.3µm (Virus [unattached]） (Carbon dust） (Sea salt） (All combustion smoke） (Radon progeny） | All types of cleanrooms |
| ≧98% at 0.3µm | H11 | ≧95% at MPPS | ||||
| ≧99.97% at 0.3µm | TYPE A | |||||
| ≧99.99% at 0.3µm | TYPE C | H12 | ≧99.5% at MPPS | |||
| ≧99.995% at 0.3µm | H13 | ≧99.95% at MPPS | ||||
| ≧99.999% at 0.3µm | TYPE D | H14 | ≧99.995% at MPPS | |||
| ULPA Filter (U Class) | ≧99.9995% at 0.12µm | TYPE F | U15 | ≧99.9995% at MPPS | Particle size bigger than 0.12µm | super cleanroom |
| ≧99.99995% at 0.12µm | U16 | ≧99.99995% at MPPS | ||||
| ≧99.999995% at 0.12µm | U17 | ≧99.999995% at MPPS | ||||
Note :
1. AFI : American Filter Institute
2. NBS : National Bureau of Standards
3. ASHRAE : American Society of Heating Refrigerating & Air-conditioning Engineers
4. MERV : Minimum Efficiency Reporting Value
5. MPPS : Most Penetrating Particle Size
6. HEPA : High Efficiency Particulate Air Filter
7. ULPA : Ultra Low Penetration Air Filter
8. Am : Average Arrestance Efficiency for Coarse Filters
9. Em : Average Efficiency for Fine Filters
10. IEST : Institute of Environmental Sciences and Technology
