Hunter Hepatech 27 Air Purification System Multi-stage air purification system. CADR rated to clean a medium sized room of 10' x 12' and change the air six times per hour with 100 CFM. Micro-filter removes particles as small as .1 microns including smoke, dust, pollen and virtually all airborn allergens. Quiet, powerful airflow. Easy to use controls with 3-speed fan and power light indicator. Portable design is easy to move from room to room, for desktop or table top use. Separate ionizer switch. Filter change indicator alerts user when to change filter. Drop in filter pack results in easy filter changing without moving the unit. 5-year warranty on motor, 1-year parts and labor.