The Blueaire 203 air purifier uses patented HEPASilent filters that allow air to flow freely through the unit, eliminating the need for powerful, noisy fans, and filtered air is discharged diffusely from vents, resulting in no noticeable draft. Despite its quiet operation, the device is powerful enough to recycle air in a 175 sq ft room six times every hour. The filters are easily accessed and replaced, the casters allow ease of maneuverability, and the exterior wipes clean. This new and improved unit also comes with a built in filter change indicator light! Includes one set of filters. Consider the Blueair 203 air purifier as your home air purifier or as your office or business air purifier.