Air Filter Paper

- Aug 25, 2018 -

Pleated paper filter elements are the nearly exclusive choice for automobile engine air cleaners, because they are efficient, easy to service, and cost-effective. The "paper" term is somewhat misleading, as the filter media are considerably different from papers used for writing or packaging, etc. There is a persistent belief among tuners, fomented by advertising for aftermarket non-paper replacement filters, that paper filters flow poorly and thus restrict engine performance. In fact, as long as a pleated-paper filter is sized appropriately for the airflow volumes encountered in a particular application, such filters present only trivial restriction to flow until the filter has become significantly clogged with dirt. Construction equipment engines also use this.

UsageClassPerformancePerformance testParticulate size 
approaching 100% retention
Test Standard
Coarse filters

(used as


G165%Average value>5 µmBS EN779
G265–80%Average value>5 µmBS EN779
G380–90%Average value>5 µmBS EN779
G490%–Average value>5 µmBS EN779
Fine filters

(used as


M540–60%Average value>5 µmBS EN779
M660–80%Average value>2 µmBS EN779
F780–90%Average value>2 µmBS EN779
F890–95%Average value>1 µmBS EN779
F995%–Average value>1 µmBS EN779
Semi HEPAE1085%Minimum value>1 µmBS EN1822
E1195%Minimum value>0.5 µmBS EN1822
E1299.5%Minimum value>0.5 µmBS EN1822
HEPAH1399.95%Minimum value>0.3 µmBS EN1822
H1499.995%Minimum value>0.3 µmBS EN1822
ULPAU1599.9995%Minimum value>0.3 µmBS EN1822
U1699.99995%Minimum value>0.3 µmBS EN1822
U1799.999995%Minimum value>0.3 µmBS EN1822

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