Honeywell Hepa Air Purifier

Some ionic air purifiers have fans and others don't. Those with fans can be noisy or very quiet, depending on the brand. Those without fans rely on existing air currents - caused by ceiling fans, human movement, and so on - to carry the ions to the various nooks and crannies of the room. If you buy one with no fan, be sure to place the unit accordingly. If you buy one with a fan, wipe off the grille once in awhile, just as you would with a ceiling fan.

One variation on the ionic air purifier is the electrostatic air purifier. It works by actually drawing air in through a carbon or HEPA pre-filter, which catches larger particles such as dust and pet dander. Then, the smaller particles, such as aerosols, pass through an electrical field, which ionically charges the pollutants. Immediately the newly charged particles are caught upon magnetized plates. To maintain peak efficiency, you periodically wash the filter, the electronic cell, and the electrostatic collector plates. This could be anywhere from every week to every six months, depending on air quality.

Most ionic air purifiers produce some ozone as a byproduct of ionization. Ozone has a distinct, "fresh" smell that can help to reduce and mask certain odors. But ozone can be bad for your health when exposed in large amounts or for a long period of time. Be sure to buy a unit that emits 50 parts per billion or fewer.
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Air Purifiers Info provides detailed information on home, ionic, ozone, and HEPA air purifiers, as well as reviews of the best air purifiers on the market today. Air Purifiers Info is the sister site of Air Filters Web.