Aerosol classification

Particle size Particle examples Filter grade Application examples
Coarse-particle filters, for particles > 10µm
  • 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...10µm
  • 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 <1µm
  • 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