There are five mechanisms by which particles are filtered from the air by air filter media. They include Straining (Sieving), Interception, Diffusion and Intertial seperation and Electrostatic attraction. Each mechanism has a certain size range where it is the dominant factor for filtration of particles. Inertial separation and interception are the dominant collection mechanisms for particles greater than 0.2 μm, and diffusion is dominant for particles less than 0.2 μm. Electrostatic attraction is obtained by charging the media as a part of the manufacturing process.
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