When it comes to air purification, there are two main types of HEPA filters: True HEPA and HEPA-type. While both filters are widely used in the air purifier industry, there are some key differences between them that are important to understand. True HEPA filters are the only type of filter that meets the DOE standard for HEPA filtration, has the highest efficiency, and reaches the 99.97% threshold for capturing particles as small as 0.3 microns. On the other hand, HEPA-type filters have an efficiency rate of 99% to capture particles as small as 2 microns. The first HEPA filter was created in 1940 by American scientists for the Manhattan Project during World War II.
According to the Institute of Environmental Science and Technology (IEST), there are six types of HEPA filters: A, B, C, D and E&F. The United States, through the Manhattan Project, created the first HEPA filter in history to capture radioactive particles. Medical HEPA filters, which are often advertised as H13 filters, supposedly outperform common HEPA filters. In terms of design, both True HEPA and HEPA-type filters have a fold-like design. However, they are not made of the same materials.
HEPA-type filters are mainly made of fiberglass, while True HEPA is a blend of cellulose (20%) and polyester (80%).True HEPA filters are great for removing particulates from the air, but they have no effect on gaseous pollutants, such as volatile organic compounds (VOCs) or odors. This is why many air purifier brands combine a True HEPA filter with charcoal or activated carbon to capture gaseous pollutants. When it comes to performance, many air purifier brands can fool you into claiming to have an authentic HEPA filter. This is usually the standard for HEPA filters with critical functions, such as in nuclear or sanitary installations. However, there is no widely accepted definition of HEPA performance in consumer products. As an expert in air purification technology, it is important to understand the differences between True HEPA and HEPA-type filters.
True HEPA filters are the only type that meets the DOE standard for filtration and has the highest efficiency rate. On the other hand, HEPA-type filters have an efficiency rate of 99% to capture particles as small as 2 microns. Additionally, True HEPA filters are made from a blend of cellulose and polyester while HEPA-type filters are made from fiberglass. It is also important to note that True HEPA filters do not capture gaseous pollutants while many air purifier brands combine a True HEPA filter with charcoal or activated carbon to capture gaseous pollutants. In conclusion, understanding the differences between True HEPA and HEPA-type filters is essential for anyone looking to purchase an air purifier.
Knowing which type of filter is best suited for your needs will help you make an informed decision when it comes to choosing an air purifier.