The air-cleaning power of this air purifier is hard to beat. When you want your air to be truly clean, and you have a lot of it to clean, this unit will use all of its four filters, and the pre-filter, to do the job. Rated for cleaning the air for areas as large as 1,800 square feet, this unit uses a pre-filter, carbon filter, HEPA filter and two anti-microbial filters to decimate odors and trap bacteria. Large particles don't stand a chance with the pre-filter for large particles and the 22 lb MAC-B carbon filter. The sandstone color makes the unit fit into any room that uses neutral colors. The fan is quiet and the casters on the bottom of the unit make it easy to roll it from room to room.