For nearly a decade Allerair has provided safe, efficient air cleaners to tackle any air quality need. These units provide extremely effective and efficient filtration by combining the industry gold standard HEPA filter with a carbon filter containing a substantial amount of activated carbon. Used in combination, these filters absorb 99.97% of all airborne particles including chemicals, gases and odors. With the exception of the portable AirTube, all of the cleaners cover a large area (1500 square feet). In addition, the high-flow cylindrical design can cycle 400 cubic feet of air every minute. All of these outstanding features make these models a health-conscious addition to any home or commercial space.