The Austin Air HealthMate HM400 Filter uses medical-grade HEPA filtration to remove up to 99.97% of airborne particles as small as 0.3 microns and 95% of particles down to 0.1 micron in size.

Filter Specifications:

Stage 1
Large Particle Pre-Filter removes particles easily seen by the naked eye, such as dust, hair, and pet dander.
Stage 2
Medium Particle Pre-Filter removes small to medium-sized particles, such as mold spores and pollen. Color: Gray, blue, or green.
Stage 3
Activated Carbon and Zeolite (over 780 cubic inches) removes chemicals, gases, and odors.
Stage 4
60 sq. ft. of True Medical-Grade HEPA removes 99.97% of particles larger than 0.3 microns and 95% of particles larger than 0.1 microns, including bacteria, viruses, allergens, and fine dust