Good air purifier....BUT
While I believe the Oreck ProShield is working well, it is, in my opinion, very noisey. It uses electrically charged plates, when the particles flow through, they are drawn to the plates. When this happens, sometimes (or quite often as I have found) it makes a electrical snap type noise. Imagine a really bad static eletricity pop. That's about what it sounds like. The owner's manual states that when this happens frequently, the "truman cell" needs to be cleaned. I have owned this now for 3 days and have cleaned it twice. There was a thin layer of dust that I assumed was making all the noise, after cleaning, the noise was gone for the most part...until about 4-6 hours later. (Note: It takes several hours to dry after cleaning.) I have this placed in my living room and have to turn it off to watch TV due to the amount of popping noises it makes (about 15-20 pops per minute) I can't imagine using it in my bedroom at night.
Now on to the positive side, like I said, it seems to...
No Regrets
I bought my unit two years ago directly from Oreck and I've never had any problems with it. I live in a city that has smog problems in the winter. And some days the air is so bad I couldn't even find relief at home. This product solved the problem. I stopped coughing at night. I stopped sneezing. I stopped waking up with a sore throat.
I don't know that the unit removes 99.9% of dust particles from the air as claimed. But if it removes even 75% then that's a major improvement in air quality. I definitely notice the difference.
My only problem is that the old man in the commercial said that it would cut down on dust and that I would see less dust in the room. I think the reality is that the unit emits an electrostatic charge to dust particles throughout the room. Some of that dust is captured by the unit and the rest of it sticks to surfaces around the room. The electrostatic charge causes the dust to stick to surfaces rather than float in the air; which means...
Produces ozone, bad for lungs. Clean, dry 6 to 24 hours every few weeks. Filtration much worse than "true HEPA" air purifiers.
Oreck ProShield is not recommended, not rated by Consumer Reports magazine.
The removable assembly of metal plates and wires is called "Truman Cell". The cell has wires to ionize the air particles which are then captured by electrically charged metal plates.
Problems with the Truman Cell :
(1) Cell produces ozone, which is converted to oxygen by the non-removable zeolite panel after it. This panel gets clogged with dust after 6 months and stops converting. Vacuuming does little good.
Ozone increases in concentration inside your house, damages your lungs and can cause lung cancer. Ozone is an air pollutant and health hazard reported daily by the weather service.
Search on the internet about ozone generators. The instructions will tell you to "close off and vacate" the area to be treated. "Make sure the unit has been turned off for about an hour" before reoccupying the space. That is, people or pets should not be in areas with much ozone...
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