Many people still misunderstand HEPA filtration system. Even many of the industrial experts are unaware of what HEPA filtration exactly is. The HEPA filtration system is often mistakenly taken as vacuum HEPA. In this post, we will try to answer these questions and clear various misconceptions going around for HEPA filtration system.
HEPA filtration systems are rated in terms of percentage of particles they filter and as per the size of the particles. HEPA specifications gives reading as 99.97 percent at 0.3 microns, meaning that the filter will trap 99.97 percent of particles of as little as 0.3 microns. In order to be categorized as HEPA, the filter must trap particles as little as 0.3 microns.
The lowest HEPA class is H10, with 85 percent of the particles being trapped. The highest range of HEPA filter class is H14, which must filter 99.995 percent of the particles. Hence, HEPA is generally a rating scale that determines a filtration level. All these classifications need to filter particles as little as 0.3 microns; however, the difference between these classes is based on the percentage of particles being trapped by the filter.
What does a customer look for when he asks about HEPA filtration?
In vacuum industry, HEPA filtration system actually implies a specific level of HEPA filtration. A very often encountered question from the customer is whether or not the filter in the vacuum is the HEPA filter. As long as around 85 percent of the particle either 0.3 microns or smaller, are trapped by the filter, the filter can technically be termed as a HEPA filter.
There are customers who look for HEPA filter to be used in their vacuum, and they suppose that the efficiency rate would be 99.99 percent for particles as tiny as 0.3 or 0.1 microns. It must be noted that in HEPA filter, the efficiency rate could be as low as 85 percent at 0.3 microns.