Classification Air Filters and Efficiency



VentPro Table Air Filter


CLASSIFICATION Arrestance or Dust Spot Efficiency US
European Union EN779 Class Typical Controlled Contaminant Application
PRE Filter (G Class) AFI <65 % MERV 1 G1 Am< 65% Particle bigger than 10.0µm
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
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