CleanAirKits - Triple Exhalaron

Replying to this late but the most efficient AND quietest air purifiers are the ones made with PC cooling fans from cleanairkits.com . I have their Exhalaron and it’s barely audible on high

As others have mentioned, build yourself a Corsi-Rosenthal cube or get a cleanairkit that uses MERV 13 filters. I'm severely allergic to dust and dust mites and I have been astounded at the amount of dust my cube picks up. We even bought a 3d printed frame for ours off of Etsy so it looks a bit nicer than a bunch of air filters with tape. I've had one running in my home continually for 2 years. Equally if not more important: get rid of every shred of carpeting and decorative rugs in your home. I have a small rug under my desk chair to protect my hardwood floor and that is all.

My wife built two of these for our house. She despises dust. They work pretty well.

One is in the front door foyer to blow up the stairs. The other is in the living room. We have a dog that sheds a lot and that's where he spends much of his day.

They work. Most are over priced though and the filters cost an arm and a leg and are where the profit is at. Most people could get away with a Corsi-Rosenthal Box, connected to a smart plug and turn it on when they cook for a drastic improvement in indoor air quality for cheap.

If you're looking to collect dust - you should make a Corsi-Rosenthal box. A HEPA isn't going to process enough air for really getting rid of dust. If you don't want to make one yourself, or want a nicer aesthetic, check out Clean Air Kit. Here's an [informative video](https://youtu.be/gaQTYrisieA?si=mjj8lAmHywe_exSu) on this topic.

Second the corsi rosenthal box. You'd need to pay 4x the price at least for comparable filtering

"Corsi-Rosenthal Box" is the way to go if you don't care about aesthetic. It's really effective for larger sq footage rooms

budget budget, build a corsi-rosenthal  otherwise, get a coway airmega. it's a little pricier than some but it has a carbon filter which is great for smells. prefilter catches a lot and saves wear and tear on the hepa panel

You can literally press a cheap furnace filter onto a running box fan to make one. It will suction itself on. Tape on the top of it if you want to move it around, check how dirty it is by hand or by flow. Technically 1 filter to 1 box fan reduces the flow, but it works. 4 filter intakes for 1 box fan is the practical/high efficiency setup people like which are called: Corsi-Rosenthal Box setups

Look up a Corsi-Rosenthal box. The modern world has a ton of cheap, reasonably high quality air filters built for furnaces in every hardware store. The cost of high end air filtration vs what a CR Box can do is pretty silly unless you're allergic or have money to burn. There are even designs and builds specifically to be more permanent than the intial construction method so you can spend 50-75 bucks on parts, then just swap filters and have something that works for like a decade.