Air filtration involves the separation of "particles" from airstreams. In order to better understand the separation techniques responsible for this phenomenon we must first define a few terms used throughout the remaining pages. This tutorial starts with a definition of “particles” in terms of their size and their unit of measure typically associated with particle size – the micron. After that, we’ll describe the formula used to calculate air filtration efficiency. We will then illustrate two types of filtration pointing out the differences between surface and depth filtration. The following four animations will explain the core filtration mechanisms that collectively contribute towards a filter's ability to capture particles in an air stream. These four mechanisms are inertial impaction, interception, diffusion, and electrostatics. In the end, we will demonstrate the cumulative effect that each filtration mechanism has on a filter’s overall efficiency as a function of particle size.
Click here to view the Air Filtration animation
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