Filter group Filter class Total value Local value
Retention Penetration Retention Penetration
EPA E 10 85 % 15 % - -
E 11 95 % 5 % - -
E 12 99.5 % 0.5 % - -
HEPA H 13 99.95 % 0.05 % 99.75 % 0.25%
H 14 99.995 % 0.005 % 99.975 % 0.025%
ULPA U 15 99.9995 % 0.0005 % 99.9975 % 0.0025%
U 16 99.99995 % 0.00005 % 99.99975 % 0.00025%
U 17 99.999995 % 0.000005 % 99.9999 % 0.0001%