CleanAirKits - Brisk Box Kit

I like the 6 fan pre-assembled and then buy the filters from costco https://www.cleanairkits.com/products/brisk-box?variant=47660329173292 Get a few based on size of your house. Wait for black Friday sales. You can honestly get at least 5 and filters and still be <$1000

Yeah it has better CADR and more energy efficient/quiet. Check out some youtube videos on it compared to the HEPA filters people are recommending.

You want the brisk box with pre-assembled 6 fan kit https://www.cleanairkits.com/products/brisk-box?variant=47660329173292 Most they go on discount is like 10-15% like twice a year. I have mine (3) hooked up to smart outlets so I can turn them all on or off when I open windows, but usually they are running 24/7. I get my 3M filters at costco when they are on sale. Has been like 10 months on one filter just fine.

They are super quiet. Some people can sleep with it in their bedroom (I'm not used to white noise/airflow like a fan so I couldn't get used to it). Takes like 10-15 mins to tape the filters into a box but if it's like once a year it's no biggie compared to performance (CADR) compared to the noise. Maybe have one per floor if you have someone with allergies or live with wildfires or something. I really like mine.

Google “Corsi-rosenthal box”. There is nothing more effective than this without spending thousands

Corsi box is where it's at. Ours is with 2'x4' filters. Sits in the foyer with high 2nd story ceilings and open to formal living, dining, and kitchen (easily 2k+ sqft), been on 24-7 for 4 years.

We built a Corsi-Rosenthal box using materials from the still-open Home Depot. All you need is four 20x20x1 MER 13 filters (coincidentally 50% off when you buy four), and a 20" box fan. It's the single best air purifier you can get, and it's one of the cheapest and most accessible. Ran us about $40 at Home Depot last night, and it cleared up all the smoke in our apartment in no time. I recommend also sealing your doors and windows with duct tape, which you'll need anyways to build the filter. Instructions for assembly: https://corsirosenthalfoundation.org/instructions/

They absolutely do work. If you don't mind the look, a Corsi-Rosenthal Box takes 15 minutes and about $70 to build and is much more effective than any standard HEPA purifier. Filters out less small particles than HEPA, but because the sheer volume of air passing through it ends up being more effective anyway.

How often do you cycle it on and off? I have a diy corsi-rosenthal box that I just run 24/7 on low

nobody has thrown it out there so I'll mention a corsi-rosenthal box. I made one last year and while I don't have a regular air purifier to compare against, I think it's been doing a pretty good job. The filters were disgusting after 6 months, anyway, which I doubt would be the case if it wasn't pulling in quite a bit of junk from the air. might be worth a shot, especially with how bad the air quality is rn

Yeah, as long as you’re cool with how ugly it might look, and also cool with rebuilding it at least twice a year, the price performance ratio basically only gets beaten by commercial options. It’s also certainly not buy it for life, but I think it’s always worth bringing up regardless just because of how easy and cheap and good it is, it’s way better than buying a fancy one and risking it taking a shit in two years.

My setup is similar! I use my Ikea Vindstyrka and a Sonoff wall outlet to control my Corsi-Rosenthal Box (https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box). The fan is set to low because it works very well with minimum noise. I initially built the filter box to manage dust during my snail-paced DIY remodel, which also includes a major project to fully monitor and automate my home. I got the Vindstyrka to monitor the interior air when I got a weather station to monitor the exterior. Added the automation soon after as one of my first HA automations. I may eventually upgrade the sensor and purifier, though I'm beyond impressed with how well this extremely basic system works for a total investment of under US$150.

i recommend [building a corsi-rosenthal box](https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fhow-to-build-a-corsi-rosenthal-box-v0-7lsewtlsza3a1.jpg%3Fwidth%3D1080%26crop%3Dsmart%26auto%3Dwebp%26s%3D750ef76a074e61f50008f0acb28f82f9e46da731), if only as a temporary solution. they work better than many commercial air purifiers. you can also make one that’s a triangle with only two air filters instead of four. it’ll work slightly less well but it’ll still work.

https://en.m.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box That will work way better. All you need is one fan and four filters. Way less static pressure for the fan. Actually one of the best, filters period

I made my own and set them around the house. https://cleanaircrew.org/box-fan-filters/

CR box, probably.

For under $100, you can build a Corsi Rosenthal box or other DIY air purifier that is just as effective as some commercial products that cost at least $1000.

I've got a corsi Rosenthal box, a levoit, a Honeywell, and one other than I can't remember the brand of right now. The CR box has a high CADR but is noisy. Works great for clearing the air or when I have guests over. The levoit is quietest and I use that in my bedroom. Makes nice background noise. The Honeywell is fine. Picked it up 2nd hand from a thrift store for $10. I use to just help keep dust and pet dander out of the air.

This is what I use. I have a couple set up, one on the main floor and one near my pet (guinea pig) cages. Does a great job. Yeah it's ugly, but the only cost is the fan and the filters themselves, and it really works.

Great post! I would also add cleanairkits.com for the quiet, high CADR air filters.   I would also potentially add a caution around the far-uv (I own the Nukit and am happy with them) that I believe you should avoid prolonged use in a room that has little ventilation.  I'm intrigued by the smaller AirFanta laminar fan :)

Good call on the corsi-rosenthal box. I have a Honeywell. Though it can run insanely quiet compared to my CR box. I ended up hacking the PCB of the Honeywell to add automation via an ESP32. The CR box runs in the basement so it's just on a smart outlet. Also nice building it with aluminum. I did mine out of furring strips and cabinet screws. Lol.

I love my CR boxes but I get that they're not for everyone. I have a Bissell Air 400 for my bedroom specifically because it's oversized for the room (better efficiency) since I have bad tree pollen allergies. I've been very happy with it.

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.