About HEPA Filters
When it comes to buying and owning a single air purifier or multiple units for a household or commercial workspace, there is one word to keep in mind. This word is the acronym HEPA. It stands for High-Efficiency Particulate Arresting. HEPA is the gold seal and standard for quality as far as air purifiers go. Not all purifiers are manufactured to this standard, and for some people, the design is not a deal breaker. However, having this kind of unit is something like driving a vehicle with power steering as opposed to one without. To be sure, the added feature is not technically necessary. But the natural question is why would you go without it, especially when they are effective at ridding the air of most every particulate?
There are a number of irritants these air purifiers clear out of the air. Some of these particulates include dust mite debris, everyday household dust, human hair and fur from various pets. Some other air pollutants Hepa air purifiers handle are bacteria, spores, mold and different types of smoke. The HEPA purifier is designed to be capture and filter pollutants from the air that measure as small as 0.3 microns. The micron, as the name suggests, is a measurement invisible to the naked eye. And anything smaller than 0.3 of a micron can get past a HEPA filter.
Hepa filters work in four different ways to trap harmful particles floating throughout the air. They use impaction, diffusion, interception and sieving. Impaction works on particles that weigh 0.5 microns or more. These particles are large enough to slam in the material of an air purifier’s mesh and are easily caught. Diffusion works for particles that are around 0.1 microns. At that size, the term impact does not really apply as the particles just float lightly through the air, but they get caught in the mesh of purifiers just the same.
Interception works for particles that are not heavy enough to pick up speed as they move throughout the air. However, they are big enough in their area that they are easily trapped when they come into contact with mesh fibers. Sieving happens when particles are 1 micron or bigger. At that size, these they are too big to fit into the spaces of fibers of a mesh. These are the particles that do most of the clogging of a purifiers mesh. When all four methods work together ninety-nine per cent of air pollutants are trapped within a HEPA filter mesh.