The industrial HEPA air purifier is a type of air filter. It is used to filter out the harmful substances or matters flowing in the air. The harmful substances in the air refer to dust, pollen, mold, bacteria and other particles that are scaled down to the size of 0.3 microns, the most penetrating particle size (MPPS). The industrial HEPA air purifier is claimed to be able to remove up to 99.95 percent of those harmful substances in the air. The maintenance of a device as such is not complicated but the cleaning needs to be done regularly as well as the replacement of the filters so that the full capacity of its function is guaranteed. To evaluate the ability of an industrial HEPA air purifier in capturing the substances, there is a report called Minimum Efficiency Reporting Values (MERVs). The rating of MERVs is from 1 to 16. The higher the rating is, the better the air purifier can capture particles in the air. This rating is established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE).
The HEPA is the acronym of High Efficiency Particulate Air. It is also known as High Efficiency Particulate Absorbing or High Efficiency Particulate Arrestance. This term indicates the efficiency standard of air filter. The air filters or air purifiers must reach a certain level of filtering efficiency to meet the HEPA standard. An air purifier must be able to filter out 99.95 percent of the substances in the air by European Standards and 99.97 percent by ASME (American Society of Mechanical Engineers) Standards and the size of the particles in the air is 0.3 microns.
The HEPA filters consist of a fiber mat. The fibers are made of fiberglass with diameters between 0.5 and 2.0 micrometers and they are randomly arranged in the mat. The diameter, thickness and face velocity are the three major factors that affect the efficiency. The space between the fibers is greater than 0.3 microns which allows the particles smaller than 0.3 microns to pass through and greater particles will be trapped. The three major mechanisms to trap the particles are diffusion, interception and impaction. The smaller flowing particles will be slowed down and stopped by the gas molecules first and stick to the fibers around them while the larger particles are unable to flow through the space of the fibers and adhere to the fibers.
There are true HEPA air purifiers and HEPA type air purifiers on the market and they are different from each other in density, pricing and efficiency. The true EHPA air purifiers are the real HEPA air purifiers that have the 99.97 percent efficiency rate. Typically, an industrial HEPA air purifier usually has true HEPA filters which have the MERVs rating from 17 to 20. An HEPA-type filter is also called HEPA-based filter. The air purifiers with this type of filters have 99 percent of efficiency or lower. The filters are made of fiber glass too but with lower density of the fibers so smaller particles are more likely to pass through HEPA-type filters. Also, their MERVs rating ranges from 13 to 16 which is lower than a true HEPA filter. As a result, the air purifiers with true HEPA filters are more expensive than those with HEPA-based filters. The customers are encouraged to view closely through the manuals or catalogs of the air purifiers to tell if they are HEPA air purifiers or not. If it claims to have 99.97 percent efficiency on particles in the size of 0.3 microns, it is a true HEPA air purifier.
Despite the fact that it is possible for particles smaller than 0.3 microns to pass through the HEPA filter, another risk is that mold and bacteria can grow on the HEPA filters. As the microorganisms adhere to the fiber and stick together, they can grow into a larger community and finally be released back to the air. This is why a periodic cleaning and replacement of the HEPA filter is required. If your industrial HEPA air purifier is not well-maintained, the function of it will become weaker and weaker.
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