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Originally Posted by redpoint5
A level 5 clean room for our engines?
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Originally Posted by oil pan 4
A cheap Fram air filter should be filtering 100% down to 1 micron.
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It's a precleaner — equivalent to the foam socks they pull over air cleaners in Baja racers.
They show sand being ejected, but smaller particles won't be as affected by the centrifugal force. My question would be if it is as effective with smaller particle size.