HEPA (High Efficiency Particulate Air) filtration is the most used method of indoor air filtration. This filter is made of layered porous fabric material that is effective at trapping particulate matter like pollen, dust, and smoke in between its fibers. 

This method of filtration is often referred to as impaction and interception because that describes how the filter works. Contaminants are captured either on the impact of their trajectory when a HEPA fiber is blocking its way or they are intercepted through static force. 

HEPA filters are very effective at capturing particles of 1 micron in size and larger, depending on their type.

H13 HEPA filters are the most effective household filters and can capture 99.9% of particles 0.3 microns in size and up. All of our Breathe+ filters utilize H13 medical-grade filters to help achieve the safety of your indoor air.