We've got one of those Ionic Breeze things here. It really does get noticeably noisy if it needs cleaned, but the good side to that is that I can watch some bluish sparky stuff bounce around between the metal uprights. Clean it, no noise and no bluish plasma. Anyhow, it works OK but we're not incredibly impressed by it. If we had it to do over, we'd probably get a more active system.
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