You Need a Built-in Fan for the Best Ion Circulation
| Ionic Air Purifier w/Fan | Ionic Air Purifier w/out Fan | |
| Negative Ion Concentration | High throughout entire room | High nearby unit, but not throughout entire room |
| Particle Collection | Excellent | Fair |
| Noise | Whisper Quietq | Silent (unless the unit is dirty, in which case you will hear a popping sound, like a bug zapper.) |
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