Hamilton Beach Air Purifier Model - #4492 1 ea Ideal for large-sized rooms this unit covers up to 180 square feet of space! Up to 10X more efficient than other ionic purifiers so you can experience the difference Energy efficient design will help save you money each month on electricity bills' Run during the night with minimal disturbances since this unit has a quiet operation Find a purifier that not only gets the job done but matches your modern lifestyle, as well!