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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

#311

Post by [deleted] »

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…

[deleted]

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

#312

Post by danans »

Dylan16807 wrote: post #299
danans wrote: post #264

Some of the best air filtering systems (and also among the most expensive) are systems like the IQAir [1], which are essentially boxes with a fan at one end and a series of filters arranged in an alternating diagonal pattern: Note: / and \ are each separate filters Filter box ___ | \ | Inflow --> / --> Outflow | \ | | / | ‾‾‾ This maximizes the filtration while reducing the static pressure, since the filtration is di…

I think the filter is rotated the wrong way in your diagram? It looks like they use a normal pleated filter.

You're right about the orientation. I've fixed the diagram. But they don't just use 1 filter, they use a series of them, like you can see at this timestamp of this video:

https://youtu.be/8f6Ih09uaDw?t=401

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

#313

Post by danans »

ahaucnx wrote: post #280
danans wrote: post #264

Some of the best air filtering systems (and also among the most expensive) are systems like the IQAir [1], which are essentially boxes with a fan at one end and a series of filters arranged in an alternating diagonal pattern: Note: / and \ are each separate filters Filter box ___ | \ | Inflow --> / --> Outflow | \ | | / | ‾‾‾ This maximizes the filtration while reducing the static pressure, since the filtration is di…

Be aware that some of the whole house systems might not have a fresh air intake. This can lead to relatively high CO2 levels inside the building and affect wellbeing and cognitive performance.

Ideally yes, they should have a fresh air intake connected to something like an HRV, but there is still value in dust/smoke/pathogen filtration even if the fresh air source for removing CO2 is a different one (i.e an open window).

They are definitely better than no air filtration at all.

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

#315

Post by IgorPartola »

Karawebnetwork wrote: post #308
IgorPartola wrote: post #303

Earlier quoted context omitted.

I recently got into building DIY air quality sensors. Any kind of smoke hangs around in a room for many hours well past when you can smell it. My house periodically spikes in air pollutants (still looking for the cause but we are moving soon anyways). The one night when PM2.5 spike from safe levels of below 12 ug/m^3 to over 1000 for one night was the worst sleep everyone in our house got. It seems that it was the eq…

> Any kind of smoke hangs around in a room for many hours well past when you can smell it. But once the sensors indicate that the PM2.5 is gone, everything is fine, right?

If that's sarcasm, you aren't providing enough context for me to pick up what you are putting down. If not, then the honest answer is "I don't know for sure, I'm still researching it."

From what I can tell, PM2.5 isn't the end-all be-all metric and sensors can give false readings. That's why I'm building multiple devices with different types of sensors and monitoring multiple metrics. PM10 and PM1.0 are also concerns, as is CO and CO2. I am researching which VOC sensors to get because unfortunately not much info is readily available. But from the research I've read PM2.5 is the most prevalent and damaging in typical households (CO being a big exception, but that's also monitored by regular household CO alarms). I can tell when someone has been frying something in the kitchen from my bedroom sensor for example, and it lingers for a while. I can also tell when outdoor air quality is poor, and then my indoor air filter and closed windows do help. I am still learning about all this, but in general this data has been helpful to figure out when to open windows to avoid headaches.

I plan on publishing my findings at some point, but currently I am still waiting on parts and PCBs and working out the software to make it more usable without having to run to grab a USB cable to flash new firmware on the sensors. I was inspired by https://www.airgradient.com/diy/ but those plans are outdated and the dashboard is proprietary so less than ideal. I am working with simply integrating my sensor network with Home Assistant so I have to do very little with frontend stuff. It was very quick to set up notifications to my phone so I don't have to look at sensor screens all the time.

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

#316

Post by Cerium »

dwaite wrote: post #301
WiseWeasel wrote: post #291

Earlier quoted context omitted.

They’d probably only do it once. It builds character, similar to == in JS or PHP.

They'd probably do it no more than ten times.

I sure did it more than ten times, but quickly learned to be careful and insert the finger slowly into the moving fan.

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

#317

Post by jb1991 »

WiseWeasel wrote: post #291
alasdair_ wrote: post #267

Earlier quoted context omitted.

We bought a Dyson fan when we had very small children that liked to stick their fingers into moving fan blades. It works really well for that purpose.

They’d probably only do it once. It builds character, similar to == in JS or PHP.

Says no one who has ever raised kids.

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

#318

Post by soylentcola »

Domenic_S wrote: post #207
soylentcola wrote: post #148

Earlier quoted context omitted.

My household vacuum cleaners have almost always been corded (with the exception of a couple battery powered ones I had 5 or 10 years ago). Granted, I didn't shell out several hundred dollars for the cordless ones, but dead batteries and replacements got old after the first round so I've stuck to corded ever since. It's just not something I ever really had a problem with. The cords are typically quite long and I never…

I was referencing GP's Festool comment - Festool does make great stuff, but in the vacuum space they mostly make dust collectors for woodshops and shop-vac style shop vacs -- not the household-style vacs we're talking about.

Gotcha. Sorry I misunderstood.

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

#319

Post by ksec »

AlexandrB wrote: post #3

Dyson : Air Products :: Beats : Audio Products Pretty much every Dyson product I've used, from the public bathroom air "blades" to the vacuums, seem like a gimmicky, inferior products with a premium price tag. None of them do their intended job better than older, cheaper products in their category. I know James Dyson is regarded as a genius engineer, but the consumer product company bearing his name seems to be 99% m…

You are giving too much Credit to Beats. They are simply Crap.

Dyson on the other hand ranges from poor like the Air Purifier to Decent with their Vacuum and Hair Dryer.

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

#320

Post by IndySun »

souprock wrote: post #274
xyzzy_plugh wrote: post #153

Earlier quoted context omitted.

What? My Dyson fan is incredibly quiet compared to any other fan I've used.

This dispute could be a matter of frequency range. Older ears can't hear high pitch. If the Dyson noise is mostly high pitch, older ears will perceive it as quieter.

I agree on the noise of the Dyson. The quietest Dyson fans are not that quiet. I work in studios that require quiet fans. A Dyson fan that rotates is especially noisy due to the squeaking motor. If you need a quiet portable fan/filter find one that is static and has more than 7-8 speeds, preferably in double figures - and put it close to where you want the air, on low.
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