Whirlpool 510 is a great purifier

I have a small NYC apartment with 3 cats. My boyfriend has minor asthma but has a problem if he spends too much time at my place - he can't breathe properly due to the cat dander / hair. First I tried an Sharper Image Ionic Breeze but that was no help - it has been sold. Then I bought this one and it works great! Problem solved. My boyfriend noticed a difference within 30 minutes of turning it on in Turbo mode. The intermediate and low modes are quiet enough for sleeping - white noise. I'm going to buy a second one so that I no longer have to carry it between my living room and bedroom when he comes over. I highly recommend it.