Winix D360 is garbage; major flaw allows dust/allergens past the filter media
I have a severe dust mite allergy and I rent a basement bedroom in a large house. Dust (just in general) ends up settling down here due to the floor plan; the flooring is "fake hardwood", so it's easy to mop, but my bedroom is "L"-shaped and dust accumulates at the far end, where my bed is. Mopping works, but the dust settles too fast for me to keep up with via mopping alone. So, I bought a Winix D360 from Home Depot a little over a year ago to help with both the dust mites and the "regular" dust problem.
The air purifier only seems to help after I change the filters, and my allergies start coming back again after about 3 weeks. I'm already doing everything I can in terms of medications and cleaning habits, so that's definitely not the problem. I decided to open up the air purifier and take it apart in case any dust, etc. had gotten behind the filter media.
Lo and behold, there are multiple points through which air is free to flow around the filter media. Past the filter media basket, the enclosure for the fan/motor assembly lacks any kind of gasket or other rubber/silicone material to form a seal against the back wall of the unit. The plastic is cut to fit inside the chassis and against the other parts, but it's plainly visible to the naked eye that this doesn't constitute the kind of seal necessary to ensure that the air is forced to flow through the filter media. I didn't take a photo of the fan/motor assembly, but rest assured, there's nothing stopping dust, etc. picked up by the carbon filter from getting all the way back to the fan and back into the air in the room.
I live on the west coast on the United States. If someone else here (especially somebody with a dust mite allergy) could recommend an air purifier with a higher build quality and some kind of gasket/other seal to keep allergens contained, I'd really appreciate it.