HEPA stands for High-Efficiency Particulate Air, a type of filter that can trap at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns. While standard filters catch large debris, HEPA-level filtration is a game-changer for people with allergies or asthma. Many of our Single-Zone units offer "Multi-Stage Filtration" options that approach these high standards. This level of "Air Purification" ensures that your indoor environment is not just comfortable, but also healthy. You can find replacement filters and specialized Accessories to maintain your system's filtration performance. In commercial PTAC or residential Multi-Zone settings, clean filters are the first line of defense against poor indoor air quality. HEPA filtration is particularly useful in "New Construction" areas where dust and construction debris may be present in the air. We recommend checking and cleaning your filters every 30-90 days for optimal airflow and health benefits.