Aerosol classification

Particle size Particle examples Filter grade Application examples

Coarse-particle filters, for particles > 10 µm

  • Insects

  • Textile fibers and hair

  • Sand

  • Flue ash

  • Pollen

  • Spores

  • Cement dust

G1
G2

  • For simple applications (e.g., as insect protection in compact units)

G3
G4

  • Pre- and circulation filters for civil-defense facilities

  • Extracted air from paint-spray stations and kitchen exhaust, etc.

  • Soiling protection for air conditioners and compact units (e.g., window air conditioners, fans, etc.)

  • Pre-filters for filter grades M6 to F8

Fine-particle filters for particles 1 ... 10 µm

  • Pollen

  • Spores

  • Cement dust

  • Particles that cause spots and dust deposits

  • Bacteria and microbes on host particles

M5

  • Outside-air filters for rooms with noncritical requirements (e.g., shop floors, storage rooms, garages)

M5
M6
F7

  • Pre- and circulation filters in central ventilation facilities

  • Final filters in air conditioning units for sales rooms, department stores, offices, and certain production rooms

  • Pre-filters for filter grades F9 to E11

  • Oil smoke and agglomerated soot

  • Tobacco smoke

  • Metal-oxide smoke

F7
F8
F9

  • Final filters in air conditioning systems for offices, production rooms, control facilities, hospitals, computer centers

  • Prefilters for filter grades E11 to H13 and activated charcoal

HEPA filters for particles < 1 µm

  • Microbes, bacteria, viruses

  • Tobacco smoke

  • Metal-oxide smoke

E10
E11
E12

  • Final filters for rooms with great and maximum requirements (e.g., laboratories; production rooms in the food and beverage, pharmaceutical, precision-mechanical, optical, and electronic industries; medical facilities)

E11

  • Final filters for clean rooms of classes 100,000 and 10,000

  • Oil vapor and soot in original state

  • Suspended radioactive particulates

E12
H13

  • Final filters for clean rooms of classes 10,000 and 100

  • Final filters in civil-defense facilities

  • Extracted-air filters in nuclear facilities

  • Aerosols

H14
U15
U16

  • Final filters for clean rooms of classes 10 and 1

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