Build & TEST 3 DIY Corsi-Rosenthal Box Fan Air Filters

Sure it's easy to make a Corsi Rosenthal Box filter, but how well do they work? I test 3 different configs of this staple of DIY engineering. I also add some legs to the design so that I can max out the performance with a 5th air filter!

You can buy this as a tape-free kit!

__SHOPPING LIST - These link help support the channel! __

_FANS_
Lasko 20in Box Fan (best price):
Air King 20in Box Fan (best performance):

_MERV 14 FILTERs_
Nordic Pure 20x20x1 (12 PACK):
(currently these are more expensive than when I filmed this a month ago)

Nordic Pure 20x20x1 (6 PACK):

_MERV 13 FILTERS_
3M Filtrete 20x20x1(4 pack)

_MERV 12 FILTERS_
Nordic Pure 20x20x1 (6 Pack):

_MERV 8 FILTERS_
Nordic Pure 20x20x1 (6 Pack):

_GAFFER TAPE_
Better than duct tape for this use

Buy literally anything on amazon at this link to help support the channel!

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I'm on Patreon!!! The reward levels are very basic for the time being but I promise to bring merch and other perks in the future.

The 3D Handyman is a production of 2 Point Media. Stay classy, folks!

[johngreen]

I'm just overwhelmed how good and complete is this vid; adding this to my "best health vid" list! this is the best vid on air filters I have seen including any commercial ones

[ericturner]

I made one out of the 20" box fan and four 20x20x1 MERV-13 filters, and leave it running in my bedroom. It definitely improves the air quality. I have dust and pollen allergies, and it has improved my breathing (and sleep) quite a bit. Bonus is it's a great white noise machine.

[LoveWins]

Man i can really appreciate how thorough and informative you are in this video. You covered all bases accurately in a very swift way without dragging on and on like most of the other videos ive seen. Thank you for taking so much time to put this together!

Your awesome!! ❤✌️

[IsItAconspiracy]

This video really explained to me well how these work. I made one incorrectly, (dont just make something you see on tiktok til you come to youtube lol) im going to remake it. Thank you for this video!

[flopsiejmcardle]

Nice that you actually test what you make instead of just throwing things together and then patting your self on the back.

[MacDaddy]

I can confirm this works great. 14x14 x12H space. Air is noticeably cleaner in there when this is running. I got a pack of 5 filters from a closeout. They were damaged, but had all the media untouched. Easy to do.

[TheDHandyman]

Don't want to tape one up? Check out my air filter kits!

[brucefleming]

I've had a model 300 for a long time but I finally upgraded to the 300s and wow what a difference it makes. Literally set it to auto and forget you own it.

[SecretlySeven]

I use one of these made with the 10" filters and a 10" box fan in my computer room. One thing I do different is the fan blows into the box. I did it to trap the dust that ends up in custom computers and gear. Has entirely eliminated the need for dusting in the room.

[howardlam]

Having another panel for the bottom is much better for air flow but also much harder for us because square filters are not popular and cost more and they also usually come in even number packs rather than odd number so you will have left overs.

[saosaqii]

Didn’t expect more hepa filters to actually work better with higher CFM.

[Tadders]

Great video production and overall content quality, btw. Very high value content.

[edwarddiaz]

Great vid, I just made version with 4 filters.

[PERSONALEEMG]

Awesome video. And I will come back for the next videos on this series.

[donnahobson]

Great video. Very concise and informative. I'm ready to build.

[Panzerjock]

Great video. I shared this with our community.

[shelleyledger]

Read the comments and your replies. I’m a little confused now. Which fan direction is more effective - in or out? Thanks!

[daolung]

Thank you very much for your suggestion.For a better result, the fan should be sucking in or blasting out air from the cube underneath ?

[howardlam]

Now we need someone to test this with PC fans 👍

[george_aurelius]

Has this been tried with the 4/5/6 inch filters? It is said the thicker filters generally provide more airflow and decreased static pressure.