HEPA stands for High-Efficiency Particulate Air. It is a type of air filter that can trap at least 99.97% of particles that are 0.3 microns in size. This includes dust, pollen, mold spores, and pet dander, making HEPA filters popular in various applications, such as vacuum cleaners, air purifiers, and HVAC systems. To qualify as a HEPA filter, it must meet specific standards set by the U.S. Department of Energy. These filters are essential for improving indoor air quality, especially for individuals with allergies or respiratory conditions. Regular maintenance and replacement of HEPA filters are necessary to ensure their effectiveness.