Winix FresHome Model P150 True HEPA Air Cleaner with PlasmaWave 3 Stage air cleaning. Effectively removes a broad range of allergens including: dust, smoke, pollen, odors, pet dander, mold spores and organic chemicals True-HEPA filtration captures 99.97-Percent of airborne pollutants, pet dander and allergens as small as 0.3 microns Plasmawave technology safely breaks apart odor, allergens, chemical vapors and other pollutants at the molecular level - without producing harmful ozone CADR rated for 150 sq ft-suitable for small bedrooms, nurseries and offices 4 Fan speeds from Quiet mode for energy efficient cleaning to Turbo for ultimate performance Note: The unit cycles thru various cleaning stages, creating variable noise levels. An intermittent clicking or buzzing noise is normal.