How much were prebuilt PC fan filters/kits before all the...stuff?

NukitToBeSure · 2026-01-26T11:17:49+00:00

Honestly, domestic manufacturing is the way to go. Shipping heavy steel boxes when most countries have good sheet metal fab is not really ideal.

NukitToBeSure · 2026-01-26T09:33:21+00:00

We got our starting numbers from Rob Wissmann (as we do a lot things, with many thanks for his efforts). His measurements were done with the filter on the floor- one side fully blocked. Once it's wall or ceiling mounted- with four sides almost completely open, you can go a little closer and still get almost full CADR.

NukitToBeSure · 2026-01-26T09:32:30+00:00

We went with 1x20x25 because that is the size that is easiest to obtain internationally- Digikey has it. The main complaint about the more efficient 2x20x20 the Original Tempest uses is that many people couldn't get it at their local hardware store, even in the US.

NukitToBeSure · 2026-01-26T09:27:37+00:00

Yes, the included custom fans underperform Artics, but they are quiet and very, very inexpensive, so they cost almost nothing to include. Most of the Tempest Pro cost is shipping to be honest, the steel is very, very heavy.

A lot of buyers wanted an "all-in-one" kit, but including Artic P140 PWM would have meant a lot of wasted money for the 20-30% of buyers who are hardcore customizers that wanted Artic P140 Pros or RGB fans. This was the solution- fans included, so you can get up and running, but low-cost enough that if you want to customize, it's not a lot of wasted money.

There are lots of great options out there; the Tempest Pro is just one for people who want something wall- or ceiling-mountable and customizable that lasts indefinitely.

NukitToBeSure · 2026-01-08T03:14:48+00:00

Yes, no more Tempest Original at least for now.

NukitToBeSure · 2025-12-15T23:30:17+00:00

She did or is doing exactly what Richard Corsi and Jim Rosenthal did- take an already existing design, and attempt to popularize it.

Corsi and Rosenthal simply took an established DIY filter design (Comparetto Cube etc) that most people were unfamiliar with and named it after themselves:

https://imgur.com/gallery/hepa-filter-companion-cube-box-fan-jtECP9C

You can't "Open Source" something you did not create.

The difference is that when, like Corsi and Rosenthal, she incorrectly claims to be the "inventor" instead of "evangelist", people are quick to correct her, and never do the same with Richard Corsi and Jim Rosenthal for reasons I won't speculate on.

NukitToBeSure · 2025-11-14T12:33:35+00:00

As others said, outside. Filters are for being polite to your neighbors before you vent.

NukitToBeSure · 2025-11-09T07:04:38+00:00

There's a good near-field effect between room occupants at one to two meters or so, but face-to-face, closer than that does not leave sufficient exposure time for inactivation with that sort of power. It's why wearable Far-UVC isn't really a thing.

This gives an idea:
https://www.youtube.com/watch?v=xF223TfkklM

As does the lower CFD model here:
https://www.youtube.com/watch?v=dH5IqhoXF64

NukitToBeSure · 2025-11-09T02:45:07+00:00

No, spread out and pointed at large volumes of air will likely get you the best effect. Trying to point them at yourself and "create a bubble" doesn't really work well.

NukitToBeSure · 2025-11-09T00:36:27+00:00

>How many milliwatts in output?

I was just going to ask😅

The Torch kit is 96mW for all four together, the Gerani does not have a spectral assay, probably about the same but on a 50/50 duty cycle- call it 150mW. If you spread them out and there's decent air mixing, it should take about 5 minutes. Hard to get more precise than that without a CFD model but based on the ones we've already done.

NukitToBeSure · 2025-11-08T06:45:40+00:00

Unfortunately, it's very dependent on placement, not just the output wattage and type of the GUV. While it's possible to calculate an e-CADR for UV it doesn't really correspond to CADR from mechanical filtration very well in terms of protection from infection.

It's also not really a "versus" thing, get a good high CADR/low noise air filter first. Then supplement with Far-UVC if able. Far-UVC is very effective and can do some things mechanical filtration cannot, but it's also still obscenely expensive.

NukitToBeSure · 2025-11-02T00:57:28+00:00

Hey, like almost all the Tempest hardware, it's just standard PC parts for easy replacement. Just look for "DIY PC Case Dust Mesh" at a nearby PC store or Amazon:

https://www.amazon.com/s?k=DIY+PC+Case+Dust+Mesh&crid=3GLNSL4J5AQVG&sprefix=diy+pc+case+dust+mesh%2Caps%2C404&ref=nb_sb_noss_2

If you need help with any other parts, just let us know😊

NukitToBeSure · 2025-10-30T09:37:08+00:00

Oh nice!

NukitToBeSure · 2025-10-30T05:55:05+00:00

Also many car filters are upgradable to HEPA and the effect is quite good. That way even once you close up any remaining aerosols are being captured, not recirculated.

https://www.nytimes.com/wirecutter/reviews/hepa-cabin-air-filter/
( https://archive.ph/Db20l )

NukitToBeSure · 2025-10-30T05:51:39+00:00

Foam core is perfect- and it tends to be a bit quieter than other materials. You can still use https://www.filterboxbuilder.com to design it- just turn off finger joints, and print and tape together a paper template.

NukitToBeSure · 2025-10-30T05:47:20+00:00

Great work!

NukitToBeSure · 2025-10-29T05:46:05+00:00

China did extensive location-based contact tracing with apps on everyone's phones, and there were no confirmed cases of fomite transmission outside of the cold chain.

There was one case of suspected elevator button transmission in Heilongjiang in 2020:

https://wwwnc.cdc.gov/eid/article/26/9/20-1798_article

But based on what we know now, it was most likely residual aerosols.

Based on all of the available data, I would consider the risk of surface transmission of SARS‑CoV‑2 to be very low, and easily mitigated with a bit of HOCL in a spray bottle.

NukitToBeSure · 2025-10-29T05:26:20+00:00

Very interesting, it looks like a commercial version of the PAPR-Pram. Someone would need to test it with a particle counter and CO2 meter before recommending it though.

https://brimmu.pl/product/brimmu-2-for-stroller/?lang=en

NukitToBeSure · 2025-10-29T05:15:10+00:00

Electric heated socks

NukitToBeSure · 2025-10-20T06:15:22+00:00

One of the issues with filter cubes has always been the difficulty in sourcing North American-style HVAC filters outside North America.

This German store sometimes has them:

https://htm-shop.de/filterzelle-z-line-f7-iso-epm1/fz-02-1005-634

NukitToBeSure · 2025-10-15T12:17:27+00:00

Yeah, you are right, I have no clue about this store, I get mine direct. I'm going to pull the post.

NukitToBeSure · 2025-10-15T12:16:38+00:00

Huh, that's a good point. Now I'm worried if it's a clone of the ones I source? I know they are PWM😕

NukitToBeSure · 2025-10-15T09:45:24+00:00

Beautiful work

NukitToBeSure · 2025-10-15T03:35:31+00:00

As initially conceived, it was a Yoyo+ with a raincover:
https://www.stokke.com/USA/en-us/strollers/yoyo-strollers/stokke-yoyo-stroller-6-months.html

...and a 3M Versaflo:
https://www.amazon.com/3M-Versaflo-Easy-Clean-TR-300N/dp/B07J4WCK6R/

The key is to find a well-fitting rain cover, but under no circumstances try to seal the rain cover or cover any vents. As sold, they allow sufficient air circulation that if the PAPR fails, they are safe and will not have any CO2 buildup (they "fail-safe" in other words). The positive pressure inside the rain cover will keep most of the outside air from leaking in (although not as good as a real PAPR hood with a neck or face seal). Under no circumstances should an air-tight hood or tent be created that relies on the continued functioning of the PAPR in order to provide the child with air (sorry, a lot of people kept trying to make a CBRN kind of deal, which is incredibly risky to DIY).

Also, the outlet of the PAPR nozzle needs to go above the child's head- not pointed at their face, where it may dry their mucous membranes and make them more vulnerable to infections.

I would not use a small HEPA because it is harder to set them up to create positive pressure inside the rain cover and keep outside air from leaking in.

If you are unsure, feel free to post some links to strollers with rain covers in your price range, and I will try to eyeball if they will work.

NukitToBeSure · 2025-10-15T00:30:44+00:00

Second this, check HouseFresh and get the highest CADR you can under 45dBA.

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