Corsi-Rosenthal Box

diffusing anything, sprspaying anything, just contributes to placing particulates into the air. bad for indoor air quality..it all builds up esp. in enclosed spaces. ( ask an aerosols engineer if you don't believe me.) get a hepa filtration appliance / air purifier or make your own Corsi Rosenthal box. you want clean air, clean air doesnt smell...these appliances provide filtration down to reduction for particles from 0.5 to 2.5 micrometers (μm), including the DIY box noted above. used in classrooms during pandemic because economical. The added plus? improves indoor air quality against viruses, wildfire smoke, cooking fumes, etc.   you can even search corsi rosenthal on reddit...

If you don’t want to DIY: https://www.cleanairkits.com/ has some silent options with PC fans. You could obviously source the fans yourself and make a frame if you had the tools.

Get you one that you can run all the time and is actually effective. These kits use PC fans for super low power and low noise filtration: https://www.cleanairkits.com/ Add it to a smart outlet if you want to turn it off. But it is so quiet and efficient you may just leave it on. It only needs “one speed”, and has no power switch. This air quality sensor works great with HA so you can see how much you need to filter: https://www.airgradient.com/indoor/

Do your research - many of the consumer grade air purifiers that you can spend a lot of money on, aren't anywhere near as good as they claim. I built a Corsi–Rosenthal Box in time to allergy season last year and had the least amount of hayfever problems ever. Cheaper than anything I could purchase too.

Both of yall should check this out if you haven’t seen it: https://www.cleanairkits.com/?srsltid=AfmBOorjw-EQpTQ_p33h__ubXLWcMDzpcqvu8tlSwgDNYHGh469c1UNj Is the Corsi-Rosenthal box style but with a little more polish so it looks good.

I still love my Corsi Rosenthal air purifier.  Its on an Alexa plug and turns on at night in my living room. 

If i wanted to upgrade from my CorsiRosenthal, this is where I'd start. https://www.cleanairkits.com/

Coris rosenthal or the Coway filters. Don't just run them now, run them all the time. Great way to remove dust, allergens, and viruses from the air.

I've bought a couple of Luggable air filters from [Clean Air Kits](https://www.cleanairkits.com/) that seem to work really well. They're tall but skinny. They're built with computer cooling fans, so they move huge amounts of air very quietly. And they use the same Filtrete MPR1900 filters that you would use in a furnace/central air system.

The only viable option for affordability short term and long term.

Try a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). (Bone up on Corsi Rosenthal boxes.) My box fan air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the savings to build more air purifiers. If you want a quiet and powerful air purifier, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kits, Luggables, and Tower of Power use furnace air filters instead of special proprietary air filters. Furnace air filters are widely available at reasonable cost due to competition and economies of scale.

Try a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). (Bone up on Corsi Rosenthal boxes.) My box fan air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the savings to build more air purifiers. If you want a quiet and powerful air purifier, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kits, Luggables, and Tower of Power use furnace air filters instead of special proprietary air filters. Furnace air filters are widely available at reasonable cost due to competition and economies of scale.

Try a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). (Bone up on Corsi Rosenthal boxes.) My box fan air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the savings to build more air purifiers. If you want a quiet and powerful air purifier, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kits, Luggables, and Tower of Power use furnace air filters instead of special proprietary air filters. Furnace air filters are widely available at reasonable cost due to competition and economies of scale.

Given that you want your air purifier to be quiet and blow air upwards, your best bet is a Brisk Box Kit from [Clean Air Kits](https://www.cleanairkits.com/). This Corsi Rosenthal box is quiet because it uses PC fans instead of a loud box fan. Best of all, the Brisk Box Kit uses furnace air filters, which have a huge cost and availability advantage over those special proprietary filters used by most commercial air purifiers.

Yes, you should be using air purifiers at home. There's no need to run out and buy an expensive one. Build yourself a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/), which is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers. If you want something quiet, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kit, Luggable, and Tower of Power use furnace air filters, which are MUCH more cost effective than the special proprietary filters that most air purifiers use.

Yes, you should be using air purifiers at home. There's no need to run out and buy an expensive one. Build yourself a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/), which is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers. If you want something quiet, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kit, Luggable, and Tower of Power use furnace air filters, which are MUCH more cost effective than the special proprietary filters that most air purifiers use.

Yes, you should be using air purifiers at home. There's no need to run out and buy an expensive one. Build yourself a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/), which is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers. If you want something quiet, try something from [Clean Air Kits](https://www.cleanairkits.com/). The Brisk Box Kit, Luggable, and Tower of Power use furnace air filters, which are MUCH more cost effective than the special proprietary filters that most air purifiers use.

Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). It's cheap AND very effective. If you want something quiet but aren't up to building an air purifier with PC fans (which is more difficult than building an air purifier out of a box fan), something from [Clean Air Kits](https://www.cleanairkits.com/) is your best bet. Like the box fan air purifier, the Brisk Box, Luggable, and Tower of Power products use furnace air filters, which are MUCH more cost effective than special proprietary filters.

Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). It's cheap AND very effective. If you want something quiet but aren't up to building an air purifier with PC fans (which is more difficult than building an air purifier out of a box fan), something from [Clean Air Kits](https://www.cleanairkits.com/) is your best bet. Like the box fan air purifier, the Brisk Box, Luggable, and Tower of Power products use furnace air filters, which are MUCH more cost effective than special proprietary filters.

Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). There's absolutely NO ozone generation here. This air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers.

I find white noise to be good for sleeping. That said, there are quiet alternatives - the Brisk Box, Luggable, and Tower of Power products from [Clean Air Kits](https://www.cleanairkits.com/). Like the rednecky box fan air purifier designs, these PC-fan-based air purifiers from Clean Air Kits use furnace air filters instead of those special proprietary air filters that are expensive and subject to discontinuation.

Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). There's absolutely NO ozone generation here. This air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers.

I find white noise to be good for sleeping. That said, there are quiet alternatives - the Brisk Box, Luggable, and Tower of Power products from [Clean Air Kits](https://www.cleanairkits.com/). Like the rednecky box fan air purifier designs, these PC-fan-based air purifiers from Clean Air Kits use furnace air filters instead of those special proprietary air filters that are expensive and subject to discontinuation.

Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). There's absolutely NO ozone generation here. This air purifier is just as effective as some commercial air purifiers that are at least 10 times more expensive. You can use the money you save to build more air purifiers.

I find white noise to be good for sleeping. That said, there are quiet alternatives - the Brisk Box, Luggable, and Tower of Power products from [Clean Air Kits](https://www.cleanairkits.com/). Like the rednecky box fan air purifier designs, these PC-fan-based air purifiers from Clean Air Kits use furnace air filters instead of those special proprietary air filters that are expensive and subject to discontinuation.

Jim Rosenthal (half of the duo behind the Corsi Rosenthal box) did an experiment comparing a Corsi Rosenthal box using MERV 11 filters against a high-end commercial air purifier using a HEPA filter. You might think that the MERV 11 filters (with lower filter efficiency than MERV 13 filters and MUCH lower filter efficiency than HEPA filters) would have been left in the dust (pun intended). In contrast, the cheaper and cruder Corsi Rosenthal box outperformed the commercial air purifier with the HEPA filter. In other words, the cheap and crude air purifier was MORE effective at cleaning the air than the expensive commercial air purifier.

r/crboxes Cheapest and best option available both up front and over time https://www.cleanairkits.com/ just an example of a pre-made kit, I'd recommend making something with a 4-5" thick filtration medium for longevity over buying a 1" filter kit. Those 4" filters last a year for $90 The total cost of a project like this should run you about $200-300 depending on what fans and materials you use