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impregnated activated carbon bed specially designed to adsorb light weight noxious airborne chemicals. J HEPA filter to trap 99.97% of solid particles as small as 0.3 microns. J 2 anti-microbial filters. J A 400 CFM (cubic feet per minute) 3 speed fan. J All metal construction to avoid plastic vapors. J Cylindrical shape to maximize air flow. Our indoor air quality experts can design over 40 different blends of specially impregnated activated carbon to deal with any specific airborne chemi