Media Filter

>Media Air Filters are made from paper or fibre "fabric" stretched across a plastic or metal frame.  Usually the media is arranged in pleats - a zigzag pattern that increases surface area devoted to collecting particles.
Although they appear solid to the naked eye, media filters are actually quite porous when viewed under a magnifying glass.  The fibres criss-cross to form an overlapping pattern, with plenty of tiny spaces for air (and small particles) to pass right through.
Media filters clean the air in three ways: by straining, by impaction (interception), and by diffusion.
Larger particles are strained out of the air, similar to the way "particles" of cooked pasta are strained when poured into a colander.  The pasta (particles) are too large to fit through the holes in the colander; the water (air) passes through easily.
Smaller particles are able to pass through the same microscopic holes that allow air through.  During their quick journey through the filter fibres, however, these small particles are jostled by random collisions with air molecules, which causes diffusion.  This diffusion causes many particles that would otherwise pass through the filter to collide with and stick to the fibres in the process of impaction.


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