Quiet on low to medium settings, easy to use, portable, works Great
Cons
Quite loud on high power, Replacement filters aren't cheap
AUG
21
2008
This Holmes air purifier has two cartridges that need to be replaced(I have found) every 4 months. It does above average on our 10 x 20 room. On high power it tends to be a little noisy, but on medium settings is just slight background noise. We have 3 cats and it has been a struggle to remove the dander and hair that seems to have been common-place until we have used this unit. We give it a two thumbs up for air quality with using this. Recommend purchasing it.
Holmes Air Purifier - HAP412N-U is recommended by magnarider