The AllerAir 6000 Exec Air Purifier boasts a larger carbon filter for gas and odor removal than the AllerAir 5000 Exec. The 6000 Exec features anti-microbial, HEPA filtration and a 22 pound MAC-B mass activated carbon filtration system. With 1800 square foot coverage, this Air Purifier is the perfect price for larger areas. The AllerAir 6000 Exec Air Purifier has an 1800 square foot coverage area and acts to eliminate large and microscopic particles, gases, odors and anti-microbial. The filter compound is anti-microbial, HEPA, MAC-B mass activated carbon filter and the 6000 Exec offers multi-stage filtration. With a CFM (cubic feet per minute) rate of 400, the AllerAir 6000 Exec Air Purifier is a floor model. The AllerAir 6000 Exec Air Purifier features 2 air changes per hour, a cleanable prefilter and an anti-microbial filter for disease carrying micro-bacteria. The MAC-B filter provides military-strength protection.