High-Efficiency Particulate Air (HEPA) filters are designed to remove a large percentage of particles in the air including small ones.
HEPA filter definition (US Department of Energy): removes >= 99.97% of airborne particles >= 0.3 microns in diameter
|
Filter Type
|
Minimum Efficiency
|
Particle Size
|
|
A
|
99.97%
|
0.3 microns
|
|
B
|
99.97%
|
0.3 microns
|
|
C
|
99.99%
|
0.3 microns
|
|
D
|
99.999%
|
0.3 microns
|
|
E
|
99.97%
|
0.3 microns
|
|
F
|
99.999%
|
0.1 to 0.2 microns
|
European Standards
|
Classification
|
Minimum Efficiency
|
|
E10
|
85%
|
|
E11
|
95%
|
|
E12
|
99.5%
|
|
H13
|
99.95%
|
|
H14
|
99.995%
|
|
U15
|
99.9995%
|
|
U16
|
99.99995%
|
|
U17
|
99.999995%
|
