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submitted 6 days ago* (last edited 6 days ago) by [email protected] to c/[email protected]

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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[-] [email protected] 6 points 6 days ago

I really need to make one of these.

[-] [email protected] 9 points 6 days ago

Filtering can be a rabbit hole.

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[-] [email protected] 6 points 6 days ago

Now it matches the rug & walls, though

[-] [email protected] 6 points 6 days ago

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

[-] [email protected] 5 points 6 days ago

I feel ya. My house was miles away from the evacuation zone of the PacNW fires a little ways back, and the filters didn't last the month. We wore masks with filters rated for smoke whenever we had to go outside, and sealed every external seam, hoping the firefighters could get it under control in time. Thankfully, they're the public servants that actually know what that phrase means, and to the enth degree. I trust every one of them right alongside our Nat'l Park service members (rangers, et al), sight unseen.

When this nation's collapse comes to your town, remember this simple rule, fellow US peeps:

Firefighters & National Park Service? Heroes of the people, through & through.

Cops, etc.? Shoot on sight (if that's your chosen theme for the apoc, ofc.) 😅

[-] [email protected] 5 points 6 days ago

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

[-] [email protected] 4 points 6 days ago

Just doing my part ground control 🫡

[-] [email protected] 1 points 5 days ago

I dont mean airflow as in rate of air moving through the fan, i mean it as in volume of air being filtered.

[-] [email protected] 3 points 6 days ago

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.

[-] [email protected] 5 points 6 days ago

Corsi-rosenthal box is stupid efficient.

[-] [email protected] 3 points 6 days ago

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

[-] [email protected] 4 points 6 days ago

Ok. I've been looking into this a lil and there are better options than a cr box.

Housefresh has been looking into this and they recommend the nukit tempest or luggable XL or another one - think it was a Canadian brand - as the cheapest total costs over time and lowest sound and most efficient purification. All of those use regular HVAC filters which cuts down on operating cost and are quite big which cuts down electricity and sound.

So recommend getting one of those for long term use, if you have the space for it.

[-] [email protected] 5 points 6 days ago

There's also an open source tempest that you can use a CNC for and customize to your liking with a script. https://github.com/opennukit/Nukit-Open-Air-Purifier/tree/main/Nukit%20Open%20Air%20Purifier-W(all)%20v1.0

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[-] [email protected] 2 points 6 days ago

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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[-] [email protected] 2 points 6 days ago

OP likes it dirty!

[-] [email protected] 3 points 6 days ago

Can you put a bag of ice in this for simple ac?

[-] [email protected] 7 points 6 days ago

You would have to go out and buy ice, if you use your own fridge to make the ice you will have a net negative energy also just buy a cheap AC, it would save so, so much energy.

[-] [email protected] 5 points 6 days ago

Oh, leaving the house? Yeah sorry i don't put pants on anymore. Good call.

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[-] [email protected] 3 points 6 days ago

Oh, that's an interesting idea, not too much different from a swamp cooler actually so ya I think it would work.

My question is, where would be the optimal spot for the ice/icepacks:

  • Inside, at the bottom
  • Inside, suspended in the middle
  • Inside, at the top near the fan
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this post was submitted on 08 Jul 2025
548 points (98.8% liked)

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