WINIX Tower XQ is our most robust and technically advanced air purifier certified for large rooms up to 628 square feet. LED Numeric Particle Sensor displays air quality measurements of fine particles down to 2.5 microns, VOC’s (volatile organic compounds), Humidity and CO2 levels. Auto mode auto-adjusts clean air delivery rate for Set-and-Forget convenience to provide fast, far-reaching 3-way air distribution. Dual filtration built into 5-stage system allows faster, more powerful filtration of contaminated air; includes two permanent fine mesh pre-filters, Coated DeOdorization (CD) Carbon Filters & True HEPAs filtering 99.97% of airborne contaminants and allergens as tiny as 0.3 microns including fine dust, hair, dander, pollen, smoke, mold, bacteria, VOC’s and odors. PlasmaWave® patented technology instantly neutralizes particles at the molecular level. Winix Smart App WIFI connects for control from anywhere including information and carefree alerts. Filter replacement LED indicator for up to 12 months service. This is the best choice for offices, schools and large indoor spaces.