They only work if air is moving, if there's no air moving (ex: fan) it does NOTHING. Place a balloon above one of the stick-style units and watch it fall to the floor. There’s virtually no air movement at all.That's why they're listed as ineffective by the majority of consumers.

Now what does work is the Oreck XL Professional Air Purifier.

"The Oreck XL Professional Air Purifier completely regenerates the air in a 30'x 30' room every hour. The unit incorporates a powerful fan that moves the air to scrub it clean. Oreck knows full well that you cannot clean the air unless you move the air just as well as agitation is vital to cleaning carpeting. The Oreck XL Professional Air Purifier will also capture and destroy bacteria, mold, viruses, and fungi, as well as remove pet hair, pet dander, dust mites, and common household dust and allergens through a 5 stage purification process."



Pre-Filter:
Fan draws in dirty air and air filter traps large particles such as hair, lint, etc.
Positive Ion Generator:
Electricity is used to positively charge small particles such as dust, smoke and pollen.
Collector:
A series of alternately charged collection plates attract and lock in dirt particles like a powerful magnet.
Charcoal Odor Absorbers:
Activated charcoal absorbs common household odors. (replace periodically).
Negative Ion Generator:
Emits negative ions which help to freshen stale air.
Clean, pure air is then returned back into the room.

Just a little knowledge for you guys today, btw i have one lolh: