How HEPA Filters Work
With HEPA filtration, glass fibers are configured such that “good” air glides through the filter. “Bad” air, on the other hand — air with allergens, mold or dust – does not.
Newer technologies have begun incorporating other methods to filter out bad particles, such that the standard for HEPA filters is that it captures 99.9% of “bad” air over a certain size (fractions of a micron).
This purity ratio is insanely commendable, and will make a large difference if you suffer from allergies or have other common air impurities in your home.
If you want to purchase a HEPA filter, be sure that it is genuine. Some products improperly describe themselves as HEPA-like to fool customers. Look for proper HEPA certification.
Also, while they are great, HEPA filters are not cure-alls. You can however improve the effectiveness of a HEPA filter buy using a model that includes a so called “pre-filter” which will address larger air particles so the HEPA can go to work on the small stuff. Your air purifier will also last longer with a pre-filter.
If you want to eliminate smells and odors, you should buy an air purifier with an activated carbon filter. Many air purifiers combine activated carbon filters with HEPA filters — most of the best models, in fact.
If you have any other HEPA questions, please feel free to write us and we’ll update this page!