HEPA stands for High-Efficiency Particulate Air. It is a type of air filter that can remove 99.97% of particles in the air that are 0.3 microns or larger. HEPA filters are commonly used in air purifiers to improve indoor air quality by trapping small particles like dust, pollen, pet dander, and smoke.
HEPA filters work by using a dense web of fibers that captures small particles as air passes through. The fibers are arranged in a random pattern, which helps to trap particles from all directions. HEPA filters are often made from materials like fiberglass, but they can also be made from other materials like plastic, ceramic, or metal.
HEPA filters are often combined with other types of air filters in air purifiers to create a multi-stage filtration system. This can improve the effectiveness of the air purifier by removing a wider range of airborne pollutants. Some air purifiers also include activated carbon filters, UV-C lights, or ionizers to further improve indoor air quality.