Designed for rooms up to 8 by 10 feet, this 55-CADR air purifier table provides air cleaning with permanent filtration efficiency and low maintenance. The unit of washable pre-filter captures large particles, while its permanent HEPA filter removes 95 percent of airborne particles like dust, pollen, tobacco smoke, cat dander and mold spores in 'air passing through the filter. To clean the permanent HEPA filter, simply vacuum four times a year and replaced by BA