This tower air filter by Blueair, the Blue Pure 311, is designed to cover an area of up to 388 sq ft and is perfect for use in any room. It features a digital display, quiet operation, and a filter replacement indicator. The unit is made of plastic and has a clean air delivery rating (CADR) of 201-350.With powerful filtration technology that includes both True HEPA and HEPA-Type filters, this air purifier can capture a variety of contaminants such as tobacco smoke, allergens, dust, dust mites, and pollen. Equipped with a dust sensor and control panel that features a digital display, the Blueair Blue Pure 311 is easy to operate and provides clean air for up to six months before a filter replacement is needed.