Hunter"s Quietflo Hepa Tower Air Purifier 30730 is designed medium sized rooms. Along with a True HEPA air filter that captures 99.97% of all airborne particles as small as 0.3 microns, it also has an advanced activated carbon pre-filter that reduces cooking, tobacco and per odors. It"s airflow design exhausts clean purified air back into the room from the top of the unit to avoid stirring up settled particles. Mechanical controls, LED Filter Change Indicator. Replacement filters: 30962/30901 pre-filter