Levoit. My allergist recommended this brand and the unit I own is easy to maintain. This is my bedroom air cleaner and it works great for eliminating pet odors as well as filtering the air of dust.
We also have a Holmes unit in our living room, which requires changes of carbon and air filters every 2 to 3 months. With the amount of dust it collects, it is definitely doing its job. This one is old, so there are probably newer brands on the market.
I order replacement filters on
Amazon.