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Re:Dyson air purifier outperformed by cheap DIY box fan filt... by wincy on Thursday February 11, 2021 @11:05AM (#26103091)
But isn't using a fan too long in an enclosed room dangerous?

https://en.wikipedia.org/wiki/Fan_death

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by mmastrac on Thursday February 11, 2021 @11:06AM (#26103101)
No. This is yet another urban myth.

"Despite no concrete evidence to support the concept, belief in fan death persists to this day in Korea,[further explanation needed] and also to a lesser extent in Japan.[1][2][3]"

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by ortusdux on Thursday February 11, 2021 @11:11AM (#26103185)
IIRC, this myth stems from a successful govt propaganda campaign that aimed to reduce power usage at night and put an end to rolling blackouts.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by mminer237 on Thursday February 11, 2021 @11:48AM (#26103797)
The Wikipedia article cites that as being yet another myth, although it is disproven by evidence of belief in fan death long before the blackouts.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by WillPostForFood on Thursday February 11, 2021 @12:02PM (#26104045)
The wiki page links to the EPA which does advise against fans in a closed room when it is over 90F:

Don't Use a portable electric fan in a closed room without windows or doors open to the outside. ... Don't Use a portable electric fan to blow extremely hot air on yourself. This can accelerate the risk of heat exhaustion. ... Don't direct the flow of portable electric fans toward yourself when room temperature is hotter than 90 °F."

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by kemayo on Thursday February 11, 2021 @12:21PM (#26104319)
That one's interesting in part because South Korea mostly doesn't get that hot. (Summer highs seem to be mid-80s Fahrenheit.)

Looking at climate data for the country, I was struck by how similar it is to upper Missouri. Saint Louis is about as humid, but a bit hotter on average. Which would make me suspect that if "fan death" was a thing, we'd be seeing it in a band of US States that're similarly hot and humid.

Speculative difference would be if air conditioning is really uncommon in South Korea, but presumably we could even that out by comparing to poorer people in the US.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by rrrrrrrrrrrryan on Thursday February 11, 2021 @12:23PM (#26104345)
I'm sure the comment was sarcastic.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by wincy on Thursday February 11, 2021 @06:13PM (#26108791)
Haha I deserve the downvotes, it’s okay. I was being dumb because I thought it was funny.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by smcl on Thursday February 11, 2021 @06:20PM (#26108854)
It's a shame, I realised you were joking and I liked it. I think the idiomatic HN way to indicate this unambiguously but subtly is ending with "/s" for "sarcasm"
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by nottorp on Friday February 12, 2021 @08:26AM (#26113363)
HN doesn't appreciate funny.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by darkerside on Thursday February 11, 2021 @07:44PM (#26109528)
It is funny :)

I grew up believing in it (because my parents), and it took me a while to shake. At some point it became more of a superstition, but was still nervous to leave it on overnight...

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by encom on Thursday February 11, 2021 @01:44PM (#26105493)
Better downvote, just to make sure. --Hackernews
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by slingnow on Friday February 12, 2021 @02:49PM (#26117787)
If you'd like a place with endless jokes and memes cluttering up conversation I hear reddit is fantastic for that.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by encom on Friday February 12, 2021 @02:56PM (#26117854)
How would you know what a joke looks like?
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by bloomingeek on Thursday February 11, 2021 @01:02PM (#26104928)
I have worked night shift for 30 years. I sleep with a box fan in my bedroom with the door shut to filter out noise. Works really well.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by renerthr on Thursday February 11, 2021 @02:45PM (#26106167)
The Japanese version of that Wikipedia article has the Japanese phrase for "Urban legend" in the title, unlike the English version. The literal translation of that title would be "Urban legend of electric fan".
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by adolph on Thursday February 11, 2021 @09:29PM (#26110147)
Some effects of extremely low frequency electromagnetic fields (ELF-EMFs) on human spermatozoaare reported. Significant increases in the values of the motility and of the other kinematic parameters have been observed when spermatozoa were exposed to an ELF-EMF with a square waveform of 5 mTamplitude and frequency of 50 Hz.

https://onlinelibrary.wiley.com/doi/pdf/10.1002/bem.20278

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by solarmist on Thursday February 11, 2021 @11:11AM (#26103178)
Lol. Been a while since I’ve seen that.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by djrogers on Thursday February 11, 2021 @11:06AM (#26103104)
No, it’s not.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by gmfawcett on Thursday February 11, 2021 @11:50AM (#26103832)
To the downvoters on wincy's comment: please let's not downvote people for asking questions, or just because you believe they are misinformed -- that's what replies are for.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by pdpi on Thursday February 11, 2021 @12:05PM (#26104080)
You shouldn't downvote people for asking questions, but asking a question and supporting it with a link that tells you the answer is fair game, especially when your "question" is an argument hidden behind a question mark, and the link disproves that argument.

There is, of course, the possibility that wincy's comment was meant to be tongue-in-cheek, though. I personally can't quite tell which way it was meant.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by mindcrime on Thursday February 11, 2021 @12:26PM (#26104395)
From the HN guidelines:

Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by Dylan16807 on Thursday February 11, 2021 @02:20PM (#26105878)
I'm not sure what you're implying, because both interpretations are valid to downvote.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by mindcrime on Thursday February 11, 2021 @04:14PM (#26107293)
I'm saying that this statement especially when your "question" is an argument hidden behind a question mark, is not consistent with the suggestion to "assume good faith" espoused in the guidelines.
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by Dylan16807 on Thursday February 11, 2021 @06:57PM (#26109202)
Ah, I see.

I will note that people make arguments via questions pretty often in normal conversation, so that's not necessarily an accusation of significant bad faith. It could be more of a complaint about rhetorical technique.

But let's treat it as an accusation of bad faith. In that case, we have a deeper issue. Assuming that it's a real question asked in good faith is actually the weakest plausible interpretation, because the link makes it a self-disproving theory. Honestly the tongue-in-cheek interpretation is probably the strongest one.

There's no way to treat it as a strong argument and as a real question asked in good faith.

Also it can be okay to downvote misinformation even when the commenter didn't do anything wrong.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by gmfawcett on Thursday February 11, 2021 @12:18PM (#26104281)
I guess I was being charitable, and imagining that the poster might be a Korean of a certain age where this myth held weight. The article suggests that young Koreans have changed attitudes, but that doesn't mean that everyone has. I think the comment replies to his question did a fine job challenging the myth. Obviously it's just my opinion, but I'd rather save downvotes for people who were clearly trolling or maliciously off-topic (and I don't see that here).
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by pdpi on Thursday February 11, 2021 @12:41PM (#26104624)
To be clear, I didn't downvote their comment — I don't think it warranted it — I'm just saying I can sympathise with the argument that a comment that doesn't add anything useful to the discussion is a fair target for a downvote.

Saying "But what about x?" when you yourself provide a link that says that X is a non-issue doesn't make for an engaging discussion. "But what about x? This link suggests it's not a problem but I think it is because of y" does make for an engaging discussion, even if y is seemingly nonsense.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by gmfawcett on Thursday February 11, 2021 @12:55PM (#26104828)
That's a fair point. Thanks for the respectful conversation about this. :)
Re:Dyson air purifier outperformed by cheap DIY box fan filt... by slingnow on Friday February 12, 2021 @02:52PM (#26117820)
Even if the person turns out to be exactly as you've described, I think that they will have the resilience to overcome these devastating downvotes.

Maybe this person could even use the downvotes as a signal that there is something seriously wrong with their belief and learn something new.

Re:Dyson air purifier outperformed by cheap DIY box fan filt... by wincy on Thursday February 11, 2021 @11:23PM (#26110718)
To be fair, I was bored at work and wanted to see what would happen if I brought up fan death on Hacker News.

I’m not Korean, but used to work at a company with quite a few second generation Korean Americans and we’d have Korean students studying in the US we hired as interns. They were very bright and very polite, but if we brought up fan death they’d say “oh haha yeah it’s funny... but it might be true”.