Amazon.com Review
By continuously circulating a room's air through two filters, this portable air cleaner removes smoke, pollen, dust, animal dander, dust mites, molds, bacteria, viruses, and odors. Invaluable for those who suffer from allergies or asthma, the cleaner contains a true HEPA filter that is at least 99.97 percent effective at trapping extremely tiny particles--and actually gets better with use, as captured particles catch other particles. A prefilter reduces odors. The cleaner measures 22 by 13-3/4 by 10 inches and, because the air exits upward, can be placed behind furniture. Recommended for rooms up to 310 square feet, the cleaner has three speeds for different-size rooms and a dirty-filter indicator. The HEPA filter lasts two to four years, the prefilter three months. (Two extra prefilters are included.) Filter replacement is simple: Lift off front, unhook elastic straps, remove prefilter and/or HEPA filter, position new filter(s), and hook up the straps.
--Fred Brack