The plastic grille that commonly covers air conditioners and purifiers is a terrible design. Each little opening in the grills attracts dust like nobody's business, and cleaning between the individual vanes is a huge pain involving lots of sneezing and swearing, not to mention you'll go through a stack of folded-up Swiffers.
I'm digging the very different design of Coway's 1008 and 1009 air purifiers, which abandons the ugly grill in favor of a long slot. The smooth housing and the slot itself look easy to de-dust, I'm guessing one pass of a Swiffer'll do it.
For the technical details of Coway's internal filtration process, click here.
via appliancist