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Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

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Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#561

Post by finnh »

StillBored wrote: post #560
brmgb wrote: post #450

Earlier quoted context omitted.

If it makes you sleep better, most household fans are designed to not severe fingers. They use plastic blades (please don't buy household fans with steel blades) which are both light and dull. You might break it but a major cut is highly unlikely.

Ever stuck your finger in a fan with a metal blade? I have, know what happened? Nothing. I have a couple 80-100 year old GE fans. Putting your finger in the front doesn't do anything but push it out. Which makes sense if you look at the shape of the blades. The side and back are a little scarier, but i'm guessing unless you really jab it in fast, or get unlucky in some way the worse that will happen is some scraped u…

I have a scar from a poorly-stitched cut on my finger from a "vintage" fan. I wasn't trying to stick my finger in it; i was absentmindedly directing it away from me and my finger apparently missed the cage and interacted instead with the blade!

Glad I still have that finger. It didn't feel particularly close to being severed, it just cut to the bone and then pushed my finger out of the way. Kinda NBD, but ER visits to teaching hospitals are always annoyingly slow...

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#562

Post by dec0dedab0de »

zaphirplane wrote: post #546
dec0dedab0de wrote: post #394

Earlier quoted context omitted.

I had the dyson fan with the heater and filter for a short time, as well as a medify. I was disappointed with both, and returned them. The dyson looked cool, but the heat function was kinda useless unless you sat right next to it. i might get another one without the heat. The medify seemed to work well, but it felt like it was poorly made. I kept thinking I could probably diy something just as good. Though the main r…

I consider the heating as warm the air in winter before blowing it on me (while filtering) not warm the room

It my experience it actually warmed the room better than it warmed me. If I turned the fan up enough to make the air reach me it was cool air by the time it got to me. If I ran it on low it would slowly warm the room.

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#563

Post by pjkundert »

andbberger wrote: post #486
pjkundert wrote: post #452

Earlier quoted context omitted.

No open air filter system interacts with more than a small volume of the air in a space! So long as it cycles the air frequently enough, eventually it will capture particles proportional to its basic filtration capability.

Yeah that's not true, diffusion exists.

Diffusion is precisely why open-air filters (filters that draw in a portion of the air and filter it) work!

The Dyson filter is an open-air filter, that draws a small sample of the air through a filter, and passes the rest through unfiltered.

Each pass reduces the average (diffused) load of contaminants.

Two identically effective filters with different flow rates will eventually achieve a specified target diffused contaminant load in the air in the space; the only difference will be the time taken to achieve this (given a fixed initial contaminant load).

This should be clear...

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#564

Post by mxfh »

the_pwner224 wrote: post #529
mxfh wrote: post #528

If you have a NAS or Fan cooled Server near your living area, put a HEPA filter in front of the Airflow. Managed to find a fitting size one for my Synology one that can simply be affixed by making an impromptu collar out of half-folded wide duct tape around the front. PM 2.5 dropped down from 25 to 5. Temperature increase is neglegible and well within safe range. Plus you get no dust in the device itself, which was m…

Interesting. Do you think it would still be effective to purity the room air when done on a desktop computer with a single 120mm intake fan (and a 140 exhaust though I assume there wouldn't be a filter on that)?

That was my next step, look at the pressure ratings for mm H2O of your fans. Problem with most cases is, they are not a single tunnel like most NAS, but would have multiple openings that might change airflow direction if you add a filter in front of a single intake.

For the NAS I trialed a range of Noctuas, but the stock fans (KM121225LL 2x120mm 2.3mmH2O) proved most reliable with the default Synology control settings. So anything in that 2mm Range should work.

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#565

Post by avesi »

catmanjan wrote: post #366
Judgmentality wrote: post #344

Earlier quoted context omitted.

Would you rather take a chance at greatness, or a certainty at mediocrity? No guts no glory.

Surely laughing when your child falls over leads to them enjoying others misfortunes

Yeah, I think there's a middle ground between teaching a child to laugh at injuries and immediately having a protective, sensitive reaction. Personally, I tell my son, "You okay, bud?" in a positive tone and wait to see whether he needs comfort or is ready to get back to playing.

Everyone parents differently. I would be interested to see which culture the "laughing" reaction parents come from.

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#566

Post by slingnow »

encom wrote: post #251
rrrrrrrrrrrryan wrote: post #144

Earlier quoted context omitted.

I'm sure the comment was sarcastic.

Better downvote, just to make sure. --Hackernews

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 filter in Marketplace test

#567

Post by andbberger »

pjkundert wrote: post #563
andbberger wrote: post #486

Earlier quoted context omitted.

Yeah that's not true, diffusion exists.

Diffusion is precisely why open-air filters (filters that draw in a portion of the air and filter it) work! The Dyson filter is an open-air filter, that draws a small sample of the air through a filter, and passes the rest through unfiltered. Each pass reduces the average (diffused) load of contaminants. Two identically effective filters with different flow rates will eventually achieve a specified target diffused co…

I agree with the second statement, was disagreeing with 'only interacts with a small volume of air'

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#568

Post by slingnow »

gmfawcett wrote: post #136
pdpi wrote: post #116

Earlier quoted context omitted.

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.

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 malici…

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 filter in Marketplace test

#569

Post by encom »

slingnow wrote: post #566
encom wrote: post #251

Earlier quoted context omitted.

Better downvote, just to make sure. --Hackernews

If you'd like a place with endless jokes and memes cluttering up conversation I hear reddit is fantastic for that.

How would you know what a joke looks like?

Re: Dyson air purifier outperformed by cheap DIY box fan filter in Marketplace test

#570

Post by citrusybread »

risyachka wrote: post #479
Spooky23 wrote: post #454

Earlier quoted context omitted.

Everything Dyson is overpriced dreck, except for the handheld. 5% more function for 200% more $. Cheap vacuums are way better than they were. I bought a $60 upright at target for my office 5 years ago, it sucks (in the good sense) and is reliable. It does not have a ton of attachments, but it was $60.

Expensive vacuums are usually more quiet and, what is more important, are way better at filtering the output air, whereas cheaper ones - sure, they work, but they let a ton of dust out. For people with allergies this is a big selling point.

Miele vacuums are less expensive and do a better job at filtering. They're also basically unkillable.

Panasonic used to also make great vacuums. Basically any canister vacuum will be well-equipped. Dyson is vacuums what Beats are to headphones.

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