Honeywell's F90 has been the standard in the Restaurant Industry for over 35 years and although copied, has never been duplicated. Cigar/cigarette smoke and eye-stinging vapors are collected on the Honeywell cells and carbon filters included in each unit. The cells are easily maintained via periodic cleaning with no costly filter replacement required. The F90 provides Coanda air distribution by drawing in dirty air from below, cleaning it electronically, and discharging the cleaned air in four directions parallel with the ceiling. The F90's three speed fan allows cleaning efficiency in light, medium and heavy customer loading conditions.