Lennox X8345 - PureAir PCO-20C MERV 16 Upgrade Kit with Insert 21x26x4

Rest assured and breathe easy with the only indoor air quality system that safely removes and destroys odors and chemical vapors. It also reduces concentrations of pollutants through a process called photocatalytic oxidation (PCO) that combines three of nature's most powerful air purifiers; ultraviolet light, titanium dioxide catalyst and hydroxyl radicals