this post was submitted on 08 Jul 2025
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Mildly Interesting

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I recently stayed in an apartment that didnt have central air so I created a corsi-rosenthal box since the smoke from the Canadian wildfires were so bad.

After 30 days of continuous use, with very minimal periods of it being turned off, this is what the filters look like!

It's disgusting yet also so satisfying to see the filters get darker from debris, dust, and dirt.

Edit: typos

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[–] Taleya@aussie.zone 11 points 3 days ago (5 children)

Christ i wish we could get these filters in au at non-arserapey prices

[–] captain_aggravated@sh.itjust.works 8 points 3 days ago (2 children)

I read that as "our-SER-uh-pee" at first. I now have a new adjective.

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[–] amino@lemmy.blahaj.zone 5 points 3 days ago

have you heard of the Ikea Starkvind filters? they're a bit smaller but you can tape together as many as you want

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[–] billwashere@lemmy.world 6 points 2 days ago

I really need to make one of these.

[–] Drekaridill@feddit.is 13 points 3 days ago (7 children)
[–] fmstrat@lemmy.nowsci.com 11 points 3 days ago (2 children)
[–] expatriado@lemmy.world 11 points 3 days ago (3 children)
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[–] kayzeekayzee@lemmy.blahaj.zone 12 points 3 days ago (3 children)

Those start out white?? I think it's time to replace mine.

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[–] Tikiporch@lemmy.world 10 points 3 days ago (1 children)

Post a new one for comparison.

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[–] Smokeydope@lemmy.world 4 points 2 days ago (7 children)

Can you talk about how you made this

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I've put an air filter in the bedroom next to the bed. Makes nice white noise too. I also have one next to the cat's litter box. I'm thinking of putting one in the bathroom because the toilet paper makes an insane amount of lint that builds up everywhere.

[–] tamman2000@lemmy.world 3 points 2 days ago

I built one back when I lived in California during fire season, and then again during the pandemic. They do such a nice job making the air less gross.

I think that's about what mine looked like after 3 or 4 weeks too...

[–] Jerb322@lemmy.world 3 points 2 days ago (1 children)

We did one with just one filter on the intake side. Kinda like this one better. But it takes up more room than mine. I'll have to do some experimenting.

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[–] ayyy@sh.itjust.works 3 points 2 days ago

Wow that’s really quick for saturating those filters! Wildfire season is the worst.

[–] jared@mander.xyz 9 points 3 days ago (1 children)

Filtering can be a rabbit hole.

[–] ITeeTechMonkey@lemmy.world 14 points 3 days ago (1 children)

Yes it can!

I was a little miffed when i went to buy the goods for this box because i couldn't get MERV 14 filters and had to settle for MERV 13.

I plan to make a frame so i can just slide filters in each side with the fan mounted on top. I'll have to figure out a means to create a nice seal between the frame and filters so the air passes through instead of around.

[–] Mastema@infosec.pub 11 points 3 days ago (1 children)

Flexible weather stripping for doors is good for this.

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[–] Toldry@lemmy.world 3 points 2 days ago (3 children)

I'm viewing this post with the Thunder app and I only see one photo: a box with a fan on top. I see no filter. Is there supposed to be a second photo?

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[–] aeronmelon@lemmy.world 5 points 3 days ago (1 children)

Good job, Captain Lovell. That’s some Apollo 13-level engineering right there.

[–] ITeeTechMonkey@lemmy.world 4 points 2 days ago

Just doing my part ground control 🫡

[–] otter@lemmy.dbzer0.com 6 points 3 days ago (1 children)

Now it matches the rug & walls, though

[–] ITeeTechMonkey@lemmy.world 6 points 3 days ago (1 children)

Funny enough I cleaned that rug after first moving in (apartment was pre-furnished) and it looked clean for a whole day.

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[–] ThatGirlKylie@lemmy.world 2 points 2 days ago (3 children)

My loft is so freaking hot I’m sweltering. Could something like this keep my loft cooler, the window unit is struggling to cool it off until late at night

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[–] LovableSidekick@lemmy.world 2 points 2 days ago

OP likes it dirty!

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