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Hi, I know an attempt to explain will be confusing. I hope the image helps decipher. Built into the door itself there is a protruding section (sticks out about 1 inch) where the HEPA filter is located, it’s just above the lower slats. On this section there is a sturdy non porous hard foam like seal that is designed into the door which seals this area from any other air/dust entering. The bottom section where the slats are located is where the removable/reusable filter is located. This slides in and out on a track. The edges are hard plastic basically creating a seal around this section as well, however because air is circulating through the sides of the unit where this second filter is located (I believe it’s for improved filtration but also to catch pet hair, etc. from going through the unit) you will see some light dust that may appear on outer fan slats just below the HEPA filter if you don’t clean it regularly. Don’t let this deter you. I have a rare untreatable disease which quickly went to my heart & lungs. It turn my asthma into treatment resistant and it was uncontrolled for well over a year w/only 30% lung function. I did extensive research on all units so frustrated over previous ones being hype and a lot of wasted money & expensive filter changes. I have a two story house/vaulted ceilings 5 cats, 2 dogs, and a rat, so I purchased both the 211 plus, and this unit together. In less than 2 weeks I no longer had uncontrolled asthma, in fact I don’t even use half the medicines I had been using when my asthma was controlled prior to this disease complicating the condition. The units even cleared up long standing sinusitis. Absolutely the very best purchase I’ve ever made. It has done more for me, my conditions, & my health than all my doctors & pharmaceutical Co’s combined. This particular unit runs pretty much 24/7 and the HEPA filters still look brand new. The overall dust in my home went from “R U Kidding” to “Maybe i’ll dust next month”…major difference. (I do also use a fine particle 3M HVAC filter) The home always smells fresh/clean & u would not otherwise know I had animals living here too. I’ve had the units a few months now (purchased may?) and have only cleaned the bottom filters twice I believe if u wiped them down more often you would see no dust at all on fan slats. BlueAir customer service is also exceptional. I can’t imagine anyone with or without health conditions finding a single negative on this particular high-end unit. I say without any reservation, buy it, and I'm not a “do a review” kinda person, ever. Until you had an unanswered question. I believe u have 30 days to return if your not happy, I’m confident you’ll be happy and will want to keep it too! Happy breathing….
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