This 30" tower air purifier by Honeywell is ideal for medium-sized rooms (up to 170 sq.ft.). Its Hepa-type filter is particularly effective in removing 99% of dust, pollen, tobacco smoke, animal danger and mold spores in the air. The lifetime permanent filter never needs replacing. It can be cleaned easily, simply rinse with water. In addition, an electronic indicator indicates when filter cleaning is recommended. 5-year limited warranty.