DESC: LakeAir's triple action filtering system works like a pollution magnet, trapping up to 97% of particles as small as one-millionth of one inch for a healthier business or industrial environments. Model LA-1400S can be used in bars, casinos, restaurants, meeting halls, bowling alleys, clubs or anywhere you desire clean, fresh air. The prefilter removes dust, hair, lint, and larger dust particles. The electrostatic filter removes particles as small as 0.01 microns in size, such as tobacco smoke, fumes, dust, mold spores, and vapors. The optional activated charcoal after filter eliminates stubborn odors.