It’s a commonly used acronym, and a typical way to purify indoor air, but what exactly is a combined air filter?

It stands for high efficiency particulate air, and it’s a way of categorizing the quality of combined air filters built to remove dust, pollen, pet dander, mold, bacteria, and other airborne particles from indoor air.

A combined air filter of quality used within heating, ventilation, and air conditioning systems can greatly improve the quality of indoor air by filtering small particles of greatest health concern.

Combined air filters work by trapping pollutants in the fibers of their paper-like material. A combined air filter can, theoretically, trap particles as small as 0.3 microns (for reference a human hair may be between 17 and 180 microns in width.) That means that when placed in a filtration system, combined air filters can remove 99.97 percent of particles from the air.

This article comes from healthline edit released