HEPA air filters-Talk about them
In general, there are five main technologies used in air purifiers in the market. As everyone knows, the air purifier that is fitted with a combination of various technologies is much better than those with only one technology. This combination enables it to maximize favorable factors and minimize unfavorable ones. In order to provide you with some guidelines on buying an air purifier, a detailed comparison of the five main technologies is made below.
HEPA Air Filters
As the most effective and efficient kind of air filter in the market, the HEPA air filter is able to capture about 99.97% of pollutant particles as tiny as 0.3 microns. With the purpose of eliminating radioactive dust from its plants, the Atomic Energy Commission invented the HEPA air filter during the Second World War, and then the Department of Homeland Security in the United States improved it.
Advantages of HEPA air filter:
- Eliminates dust, pollens, mold spores, dust mites and other allergens;
- Removes a lot of bacteria;
- Captures pollutant particles permanently.
Disadvantages of HEPA air filter:
- Does not dispose of chemical fumes, gases, various odors or smoke;
- Does not deal with fine or ultra-fine pollutants, viruses, bacteria or germs.
- Hardly able to remove airborne particles from across the room because they need to be drawn through the filter.
- It is likely that micro-organisms absorbed in the filter will breed or reproduce afterwards.
The HEPA air filter technology is often used only on products that cost over $200 as this technology is advanced. Also, it is not used alone. It needs to work together with other technology such as the activated carbon air filter and air ionizer to have complete efficacy against chemical fumes，odors, smoke, viruses and bacteria.
Air cleanning machine with HEPA air filters
A good example of HEPA air filter usage is the Honeywell 50250 air purifier.