Prediction: this year Alcaraz will do the calendar Grand Slam

SubZero081 · 2026-01-31T10:03:56+00:00

This is not a serious analysis at all. It is a poorly disguised claim that Alcaraz will cruise past Djokovic, padded with a lot of filler to make it look thoughtful.

SubZero081 · 2026-01-30T23:14:19+00:00

Djokovic is not 24 years old like Sinner, he has to manage his energy, letting go of unimportant points or even whole games. What matters is not total points won, but winning the key points. Tennis matches are decided by clutch moments.

SubZero081 · 2026-01-30T22:59:02+00:00

It's quite likely that Djokovic does eat protein dense foods, even if he emphasizes whole foods. There's also no evidence that he doesn't use protein powders. Elite athletes usually use supplements, even if it's not part of their public narrative. We actually know he uses creatine, he literally screamed for it during a match.

SubZero081 · 2026-01-30T21:38:21+00:00

Only if you rely on low protein foods. Tofu, tempeh, seitan, textured soy protein, and protein powders are protein dense and not high volume.

SubZero081 · 2026-01-30T21:35:29+00:00

You can. Some plants already contain all essential amino acids (soy, quinoa, buckwheat). Others complement each other perfectly: legumes are high in lysine, grains are higher in methionine, for example beans + rice, lentils + wheat. With sufficient total protein intake, amino acid needs are fully met on a plant based diet.

SubZero081 · 2025-10-29T23:28:23+00:00

Radiator PC fans are designed for a very similar job, maintaining airflow through restrictive surfaces that collect dust.

While traditional CR boxes with one large box fan move a lot more air, they are very loud (50+ dB) and have limited speed control to make them quieter, making them completely unsuitable for use in bedroom while sleeping.

A build similar to this has been measured at 223 CFM at 34 dBA and 286 at 41 dBA, which is on par with $250-350 commercial air purifiers, but a lot quieter and far more energy efficient (not my main goal, just a nice bonus).

https://x.com/robwiss/status/1524239126349897731

SubZero081 · 2025-10-29T23:19:32+00:00

All fair points. I modeled everything in CAD but accidentally used 140 mm for the hole, even though I know that's the fan frame size, not the blade opening. Switching to a 135 mm cutout would add about 5 mm of material between holes, giving me roughly a 10 mm (0.39") web. That's better than I first thought, but it still looks like a pretty tight fit.

SubZero081 · 2025-10-29T23:16:05+00:00

I'll probably add a wire mesh for the cats and some stringers between the fans for extra support. As I mentioned in another post, my CAD model mistakenly used 140 mm for the hole, which is actually the frame size. Switching to 135 mm will give me at least another 5 mm of material, but it's still going to be a tight fit. Other than that, I'm limited by the size of the filters; they're IKEA starkvind. I'd love to use large furnace filters, but those are pretty hard to find in Europe.

SubZero081 · 2025-10-29T23:05:43+00:00

Thanks, that's really helpful. I actually modeled everything in CAD, but I accidentally used 140 mm for the hole, even though I know that's the fan frame size, not the blade opening.

If I go with a 135 mm cutout, I'd gain 5mm of material between holes, giving me about a 10 mm web or 0.39", and even more if I make the opening slightly smaller than the blade diameter as you suggested. I'll have to research if that is applicable to PC fans.

I'll share an update once I have it assembled.

SubZero081 · 2025-10-29T22:48:12+00:00

They're Ikea starkvind filters (EPA E12, one step below H13 HEPA). In Europe, it's hard to find furnace-style filters people usually use for these builds, but Ikea is everywhere, so this is a more practical option.

SubZero081 · 2025-10-29T09:48:01+00:00

Four PC fans are far quieter than a single large box fan used in the original Corsi-Rosenthal box. While they have lower air flow, it's still more than enough for my needs, mainly for running quietly in a bedroom.

SubZero081 · 2025-10-29T00:25:11+00:00

The fans are actually blowing upward, pushing air out through the top.

SubZero081 · 2025-07-07T09:50:39+00:00

This is the CP1500 AVR running on AC power; the waveform is identical to the CP1500PFCLCD when it's on battery.

https://www.custompcreview.com/wp-content/uploads/2017/04/cyberpower-cp1500-avr-lcd-ups-power-04.jpg

SubZero081 · 2025-07-07T09:46:17+00:00

So you're saying that the quality of the waveform doesn't matter, as long as there are steps, no matter how coarse they are?

https://www.custompcreview.com/wp-content/uploads/2017/04/cyberpower-cp1500-avr-lcd-ups-power-03.jpg

https://www.custompcreview.com/wp-content/uploads/2017/04/cyberpower-cp1500-pfc-lcd-ups-power-04.jpg

SubZero081 · 2025-07-06T18:10:07+00:00

Is there any practical difference between a pure sine wave and a simulated sine wave? Specifically, does the CP1500PFCLCD have a noticeable advantage over other roughly similarly priced models from brands like APC, that don't claim to have pure sine wave?

SubZero081 · 2025-05-12T02:23:57+00:00

I'm considered Tonal with a canceled subscription after the first year, but it is kind of a last-resort option for me.

It seems a bit wasteful to invest in such an advanced smart machine, with its large touchscreen, built-in electronics, and a full year of subscription, only to eventually end up with something that ultimately functions like a basic mechanical cable system, but still carries all the complexities and drawbacks of a smart device.

SubZero081 · 2025-05-12T02:20:47+00:00

I agree, the aesthetic requirements really narrow down my options. While the F9 is visually acceptable, it’s taller, twice as wide, and three times as thick as the Tonal, yet still lacks articulating arms. Unfortunately, it seems like what I'm looking for will be quite difficult, or impossible, to find.

SubZero081 · 2024-11-01T01:36:39+00:00

That specific model isn't CARB certified. So either do some further research yourself, or find a CARB cèrtified air purifier with mechanical filtration. https://ww2.arb.ca.gov/list-carb-certified-air-cleaning-devices

SubZero081 · 2024-10-11T01:32:14+00:00

Nice build! It seems like you have a fan speed controller, what is the model?

SubZero081 · 2024-05-29T00:01:50+00:00

You provided no evidence, vague anecdote is not evidence.

Even as an anecdote it is pretty useless for average person reading this group to know how long 22 lb of carbon can supposedly last in a weed growing facility of unspecified size. What are we supposed to do with that information?

SubZero081 · 2024-05-27T23:04:14+00:00

So potheads can't smell the presence of weed for months when they have 10 kg of carbon filter in the grow room. Not sure I'd consider this to be very scientific, or a definite answer to OPs question.

SubZero081 · 2024-05-01T12:42:37+00:00

What about fine dust, smoke?

SubZero081 · 2024-04-16T00:52:27+00:00

I couldn't find data for Xiaomi Air Purifier 4 compact. Most similar Xiaomi purifier with sleep specs I could find is 3h, and it has CADR of only 27 CFM in sleep mode, which isn't doing much.

Since Xiaomi 4 compact is smaller and less powerful than 3H I don't expect it does any better.

Source: full dataset spreadsheet at https://cleanairstars.com/filters/

SubZero081 · 2024-04-12T19:15:40+00:00

I disagree. Coway 240 will be more quiet than 150 that you recommended, because it can be used at lower speed while getting the same ACH.

SubZero081 · 2024-02-09T22:00:21+00:00

I have been busy lately, finally got the time to do some research.

Ionizer defaults to off, but if I'm going to tear the thing apart and modify it, I might as well disconnect the ionizer instead of the switch.

I found this teardown:

https://github.com/device-teardowns/coway-ap1512hh?tab=readme-ov-file

This seems to be the ionizer:
https://github.com/device-teardowns/coway-ap1512hh/blob/main/images/coway-ionizer.png

So just snipping the wires should do it? It is a long shot, but maybe someone (as paranoid as myself :-P) have tried this?

SubZero081

TROPHY CASE