Grade : P =
Filter-Dust Removal Air Filter

Get rid of mass of water, the particles which bigger than 3 micron (oil content in the gas: ≤ 1ppm).

Grade : M =
Filter-oil Removal Air Filter

Get rid of liquid water, oil mist, the solid particles which bigger than 0.1 micron (oil content in the gas: ≤ 0.1ppm).

Grade : H =
Filter-High Precision Air Filter

Get rid of liquid water, oil mist, the solid particles which bigger than 0.01 micron (oil content in the gas: ≤ 0.01ppm).

Grade : C =
Filter-Activated Carbon Air Filter

The activated carbon absorb the oil vapors and hydrocarbon (oil content in the gas: ≤ 0.003ppm).