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Methods of Air Filtration - Mechanical

From Purolator

Methods of Filtration: Straining occurs when a particle is larger than the opening between fibers and cannot pass through. It is a very ineffective method of filtration because the vast majority of particles are far smaller than the spaces between the fibers. Straining will remove lint, hair, and other large particles. Impingement: As air flows through a filter, it makes repeated changes in direction as it passes around each filter. Dirt particles, especially larger particles, cannot follow the abrupt changes in direction because of their inertia. As a result, they do not follow the airstream, and they collide with a fiber. Fibers using this method are often coated with an adhesive to help retain particles on the fiber.
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