Designed specifically for artists who are also smokers, and who don't want to sacrifice clean air, the AllerAir 5000 DS Air Purifier rids the atmosphere of persistent odors, harmful chemicals and tiny particles. A tar trapping pre-filter prevents large particles from remaining in the air while a special blend of 18 pounds of active carbon helps extend dwell time. The micro-wrap filter traps small particles with a complete change in the air occurring every 30 minutes. This three speed unit is American made with only a minimum of varnish on the windings to help reduce off-gassing. Effective for use in areas of up to 1500 square feet, this unit ships for free.