Excellent
I bought this to deal with cat litter dust in a small apartment. I was hesitant to purchase this due to the high price and bad past experiences with other air cleaner products (noisy, poor quality) years ago, but have had good experiences with Sharp plasmacluster technology built-in to late-model Toyota/Lexus vehicles, so I decided to take a chance. The unit is very stylish (more-so than the pictures would indicate) and seems well constructed. It's assembled in China by Sharp.
The fan is very quiet on the lowest setting, which was important to me as the unit will run continuously. The electronic dust sensor is phenomenal. It really does detect dust in the air that's too small to see. I have the machine 6 feet from my cat's litter box, and within a minute of my cleaning the cat's mess from the litter box, the Sharp's sensor display changes from green to orange and then red, and the fan kicks into high gear. After a few minutes of cleaning the air, the display returns...
Next Generation PIC Technology
Offhand, I own two FP-P40CX, one KC-150U and two KC-860 units. Suffice to say that I am a fan of Plasmacluster (PIC) technology. While a Blueair MD Pro sits by one side of the bed, a KC-860 sits by the other. An IQAir HealthPro Plus is situated in the family room with a second KC-860 not far away. Lose one point for not retaining the timer and remote control found in previous generation FP models. As of February 2011, the KC-860 is the most powerful stand-alone PIC, room purification unit available to the general public as a consumer purchase. Despite its rather flimsy carbon filter and tested in various bathrooms and a kitchen, the KC-860 does an excellent job of controlling odors so long as the Plasmacluster feature is used. Pre-filter is built into the unit housing (ala Austin Air) for ease of maintenance. KC-860 uses the same exact filters as do KC-100U/KC-150U/KC-850U for ease of filter sourcing. Ion generation crackle is clearly audible on these new models and is likely...
Efficient, but expensive and not so easy to maintain
Good things: I had this for a year. It was better than FU-A28U that I'm using now. Comparing to FU, the KC sucks and blows much more air but similarly loud, and has an extra washable filter. The FC was able to "clean" my bedroom in hours after I got out from smoking in the bathroom, but the FU struggles a whole day. The sensor is really sensitive and useful for the lazy people.
Not-so-good things: For the price I could have 4 FUs instead of this single unit. Secondly, the water reservoir tend to attract insects. Therefore, if humidifier is used, one will have to clean the unit and replace the water every few days. And then the sensor unit is hard to clean. it's got small holes nearby that trap dust that'll affect the sensor.
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