Enjoy clean air with this Bionaire BAP1500 air purifier. It has a tower design and comes with a HEPA-type permanent filter. The electronic ionizer increases performance to reach a 170-square-foot area. The air purifier has a filter service indicator, so you will know when it is time to change the filter. The oscillation ensures the fan reaches the entire area, and it's quiet enough that you can sleep at night while it's on.