The Germ Guardian AC5350BCA Elite, 4-in-1 Digital Air Cleaning System Plus is perfect for allergy sufferers. True HEPA captures 99.99% of dust and allergens as small as .3 microns such as household dust, pet dander, mold spores and plant pollens. According to the American Academy of Pediatrics Allergy & Immunology doctors recommend HEPA air filtration systems to reduce exposure to indoor asthma triggers. More than just a filter; multiple levels of cleaning capture allergens, kill airborne germs with powerful UV-C, and fight mold and common household odors. Standing at 28-inches tall it has a sleek and lightweight design ideal for use in both large and small rooms. CADR rated at 125+ it can process air in approximately 193 square feet every hour. A choice of five different fan speeds range from ultra-quiet sleep mode to high speed. UV-C light can be turned on or off and indicators let you know when it’s time to change the UV bulb or filter. Only one single filter needs to be replaced every 6-8 months depending on the use of the product. Replacement filter is FILTER C (model FLT5000).