What are HEPA filters?

HEPA filters, which stand for High-Efficiency Particulate Air filters, are designed to trap very fine particles with high efficiency. The defining feature of HEPA filters is their ability to capture at least 99.97% of particles that are 0.3 microns in size, which includes dust, pollen, smoke, and other airborne allergens.

This capability makes them especially valuable in environments where air quality is crucial, such as hospitals, clean rooms, and laboratories. The density of the filter media allows it to effectively block these particles while still permitting airflow, which is essential for maintaining ventilation.

The other options relate to different types of filters or functions that do not accurately describe HEPA filters. Basic air filters typically do not have the same high efficiency as HEPA filters for small particulates. Humidity reduction is not a function of HEPA filters; instead, specialized dehumidifying equipment would be necessary for that purpose. Carbon filters, while useful for removing odors and certain gases, do not focus on particulate filtration as HEPA filters do. The specific function and design of HEPA filters set them apart, making their primary use in filtering fine particles essential in various applications.