Hunter 30150 is an air cleaner designed to remove visible and invisible particles of air pollution from the air you breathe. It features a washable pre-filter to trap large particles like dust and lint, two mechanical filters to remove smaller airborne particles, and a charcoal filter to remove odors. The unit has electronic controls for on/off, speed adjustment, filter monitoring, and an automatic timer to turn the unit off after a specified time. The filter monitor will indicate when the filters need to be cleaned or replaced.