The Kleenguard 412-22519 Spec Nemesis RX Smoke/Black 2,5Plus is a high performance air purifier that removes smoke, odors, and other harmful particles from the air. This unit is perfect for use in homes, offices, and other areas where air quality is important. The Kleenguard 412-22519 Spec Nemesis RX Smoke/Black 2,5Plus is easy to use and features a digital display that makes it easy to see the air quality.