DESC: The AllerAir AirTube Vocarb Air Purifier provides a powerful, yet compact option for those who want clean air that travels. It features 7 pounds of double impregnated activated MAC-B carbon to adsorb the widest range of airborne chemicals, gasses, odors and VOCs, while the HEPA filter traps up to 99.97 percent of airborne particles as small as 0.3 microns. The cylindrical shape maximizes air flow, while the all-metal casing prevents plastic off-gassing.