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An ISO 9001:2015 Certified Company

Classification of Air Filters

Avonaire Solutions is a fast growing HVAC EPC (Engineering, Procurement, Construction) Company in India providing Heating, Ventilation & Air Conditioning Solutions to clients of various industries.

Filter Classes according EN 779 and EN 1822

Particle Size Examples Filter Class Typical Applications
Coarse dust, particle size > 10 µm
  • insects
  • textile fibres and hairs
  • sand
  • fly ash
  • spores, pollen
  • cement dust
 G 1 G 2
  • simple applications (e.g. insect screens for compact machinery)
G 3 G 4
  • pre-filters and circulation filters for civil defense shelters
  • exhaust filters for spray painting booths, kitchens, etc.
  • inlet air filters for air conditioners and compact machines (e.g. window air conditioners, ventilators)
  • pre-filters for Filter Classes M6 to F8
Fine dust, particle size 1 – 10 µm
  • pollen
  • spores
  • cement dust
  • fly ash
  • bacteria and germs on host particles
 M 5
  • outside-air inlet filters for rooms with low purity requirements (e.g. factories, warehouse facilities, garages)
M 5 M 6 F 7
  • pre-filters and circulation filters in central ventilation stations
  • final filters for air conditioning of sales rooms, department stores, offices and certain production plants
  • pre-filters for Filter Classes F9 to E11
  • oil fumes and agglomerated soot
  • tobacco smoke
  • metallic-oxide smoke
 F 7 F 8 F 9
  • final filters for air conditioning of offices, production plants, control centres, hospitals, EDP centres
  • pre-filters for filter classes E11 to H13 and activated carbon
Suspended particulates, particle size < 1 µm
  • germs, bacteria, viruses
  • tobacco smoke
  • metallic-oxide smoke
 E 10 E 11 E 12
  • final filters for rooms with high and highest purity requirements (e.g. for laboratories, for foods processing, pharmaceutical, fine mechanical, optical or electronics plants or medical facilities)
E 11
  • final filters for clean rooms, Classes 100,000 or 10,000
  • oil fumes and soot in nascent state
  • radioactive suspended particulates
 E 12 H 13
  • final filters for clean rooms, Classes 10,000 or 100
  • final filters in civil defense shelters
  • exhaust air filters in nuclear plants
  • aerosols
 H 14 U 15 U 16
  • final filters for clean rooms, Classes 10 or 1

Classification of Coarse and Fine Filters according EN 779:2002

Filter Class Final Test Pressure Drop Average Arrestance(Am) of ASHRAE test dust Average Efficiency(Em) of 0.4 µm particles
Pa
G1 250 50% ≤ Am < 65% –
G2 250 65% ≤ Am < 80% –
G3 250 80% ≤ Am < 90% –
G4 250 90% ≤ Am –
F5 450 – 40% ≤ Em < 60%
F6 450 – 60% ≤ Em < 80%
F7 450 – 80% ≤ Em < 90%
F8 450 – 90% ≤ Em < 95%
F9 450 – 95% ≤ Em

Classification of Coarse, Medium and Fine filters according EN 779:2012

Filter Class Final Test Pressure Drop Average Arrestance (Am) of ASHRAE test dust Average Efficiency (Em) of 0.4 µm particles Minimum Efficiency* of 0.4 µm particles
Pa
G1 250 50% ≤ Am < 65% – –
G2 250 65% ≤ Am < 80% – –
G3 250 80% ≤ Am < 90% – –
G4 250 90% ≤ Am – –
M5 450 – 40% ≤ Em < 60% –
M6 450 – 60% ≤ Em < 80% –
F7 450 – 80% ≤ Em < 90% 35%
F8 450 – 90% ≤ Em < 95% 55%
F9 450 – 95% ≤ Em 70%

Classification of High Efficiency Filters EPA and HEPA according EN 1822:2009

Filter Class Overall Value Local Value
Efficiency Penetration Efficiency Penetration
E 10 ≥85% ≤15% – –
E 11 ≥95% ≤5% – –
E 12 ≥99.5% ≤0.5% – –
H 13 ≥99.95% ≤0.05% ≥99.75% ≤0.25%
H 14 ≥99.995% ≤0.005% ≥99.975% ≤0.025%
U 15 ≥99.999 5% ≤0.000 5% ≥99.997 5% ≤0.002 5%
U 16 ≥99.999 95% ≤0.000 05% ≥99.999 75% ≤0.000 25%
U 17 ≥99.999 995% ≤0.000 005% ≥99.999 9% ≤0.000 1%

Classification according ISO 29463:2011

Filter Class Overall Value Local Value
Efficiency Penetration Efficiency Penetration
ISO 15 E ≥95% ≤5% – –
ISO 20 E ≥99% ≤1% – –
ISO 25 E ≥99.5% ≤0.5% – –
ISO 30 E ≥99.90% ≤0.1% – –
ISO 35 H ≥99.95% ≤0.05% ≥99.75% ≤0.25%
ISO 40 Hd ≥99.99% ≤0.01% ≥99.95% ≤0.05%
ISO 45 Hd ≥99.995% ≤0.005% ≥99.975% ≤0.025%
ISO 50 U ≥99.999% ≤0.001% ≥99.995% ≤0.005%
ISO 55 U ≥99.999 5% ≤0.000 5% ≥99.997 5% ≤0.002 5%
ISO 60 U ≥99.999 9% ≤0.000 1% ≥99.999 5% ≤0.000 5%
ISO 65 U ≥99.999 95% ≤0.000 05% ≥99.999 75% ≤0.000 25%
ISO 70 U ≥99.999 99% ≤0.000 01% ≥99.999 9% ≤0.000 1%
ISO 75 U ≥99.999 995% ≤0.000 005% ≥99.999 9% ≤0.000 1%