Diffusion
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Diffusion is the most difficult air filtration mechanism to imagine or explain. Very small particles come into contact with fibres due to diffusive effects. The particles collide with air molecules and are "pushed around". This effect is called Brownian motion. Because of Brownian motion, small particles don't follow the air stream precisely, but instead "vibrate" or move erratically. This erratic movement increases the probability of the particles coming into contact with filter fibres.
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