Ideal for use as a desktop purifier, for travel or for smaller rooms, this AllerAir Air Tube Exec Air Purifier is used for localized chemical, odor and particle removal. Made of metal, this model features 7 Pounds MAC B activated carbon, medical grade HEPA, pre filter for particles. With a maximum space up to 400 Square feet, this Air Purifier carries a weight up to 18 Pounds. The AirTubes are small, portable, affordable and ideal for general-purpose local filtration. As a company philosophy we generally recommend the larger units with more carbon, but for the budget-conscious these are well-built units with carbon that still offer more media than comparable models. The 360-degree air intake, variable speed dial, 4 to 10 lbs of carbon at 1 thick, HEPA for particle filtration, and a pre-filter make this an affordable carry-along option. UV is an excellent option for users who are concerned about mold, bacteria and viruses. We use only non-ozone producing germicidal UV bulbs. The UV light shines at a frequency and energy that breaks organic molecular bonds. As microorganisms pass by the UV rays this bond breakage translates into cellular or genetic damage