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Myths about HEPA filters
Myths about HEPA filtersThe HEPA filters we commonly use are rated H13, so what is the standard for H13?A filter with a filtration efficiency above 99.97% for 0.3μm particles is called H13. HEPA filters, often called HEPA filters or High-Efficiency Air Filters, are commonly used in hospital facilities, automobiles, aircraft, and household products. After understanding HEPA filters, we will talk to you about the common misconceptions about HEPA filters and PM2.5: Myth 1: HEPA can purify 0.3-micron micro-particles with an efficiency of 99.97% or more, but how effective is it in purifying 0.1-micron micro-particles? PM0.3 is more likely to break through the protection of the HEPA filter because it is less susceptible to Van der Waals forces, so a filter that is 99.97% effective against PM0.3 is 99.99% effective against PM0.1. Myth 2: Our HEPA filters can filter small particles of PM0.1 Similarly, compared to PM0.1, PM0.3 is more likely to break through the HEPA protection, so some manufacturers say they can filter small particles to the standard of PM0.1 is also problematic. Or some people say that they can only filter PM0.3 but not PM0.1, which is also unreasonable. Before installing a high-efficiency air filter, the clean room (clean room) should first be cleaned (as needed) to avoid contamination of the filter by pollutants inside. Here it is the whole clean room, for example, if the filter is installed in the technical mezzanine or the ceiling, then these areas also need to be cleaned. HEPA filters do not filter odors, if volatile organic compounds, cigarette odors, or pet dander need to be filtered, then the use of activated carbon (charcoal) needs to be added. This means that the purifier can be pre-filtered (activated charcoal) + HEPA filter used together, which can better achieve the need to filter common pollen, mold, and allergens. The HEPA filter is a high-efficiency air filter. The standard HEPA filter can filter particles as small as 0.3 microns in a single pass, with a filtration rate of at least 95 %. The single filtration rate refers to the filter's ability to filter air by comparing the change in the number of airborne particles in a single pass between the intake and discharge of fresh air. |
