STAGE 1 – Large Particle Pre-filter. Removes particles easily seen by the naked eye (e.g. dust, hair and pet dander).
STAGE 2 – Medium Particle Pre-filter. Removes small to medium size particles (e.g. molds, spores and pollen).
STAGE 3 – Over 270 cubic inches of Activated Carbon and Zeolite.  Removes chemicals, gases and odors.
STAGE 4 – 30 sq. ft. of True Medical Grade HEPA. Removes 99.97% of all particles larger than 0.3 microns and 99% of all particles larger than 0.1 microns.