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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

#531

Post by vldx »

unreal37 wrote: post #445
Tade0 wrote: post #111

Last year I bought an air purifier for ~800, but PLN ($1 = 3,7129 PLN at the time of writing) to deal with the Polish winter - already swapped out the HEPA and carbon filter( At a CADR of 300m3/h I think the price/value ratio is decent, as opposed to whatever Dyson is trying to con people into buying.

I don't think they "con" people. I bought the Dyson. I like it. I'm not looking to clean my air that much because I don't have problems with air quality. It's a misleading news program. CADR is not the biggest factor that matters to many people who can afford a Dyson.

Not to be snarky, but what’s more important for an air purifier than it’s ability to clean the air? Signal your affluence?

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

#532

Post by vldx »

hedora wrote: post #367

I wish they'd tested this DIY air filter instead. They made a 20" cube, where one face is a box fan, and four faces are filters. Brilliant: https://www.thisoldhouse.com/green-home/22231148/diy-air-fil... It should have a much higher CADR than the single filter version at lower backpressure. That means less noise and more energy efficiency.

The Blueair 211/221 they’ve tested has essentially the same design and performed best. It’s CADR is also the highest (590 m3/h). It’ll be interesting to compare them in terms of efficiency and noise levels.

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

#533

Post by Theodores »

cjohansson wrote: post #352
ortusdux wrote: post #4

I still cannot get over this product. They whole selling point of a dyson fan is the 'air multiplier' tech, which creates a low pressure zone that propels air through the ring. According to dyson, this tech can move 15x more air than the fan in the base of the unit. Why in the world would you build an air filter around a system that does not directly interact with 93% of the air it moves? https://www.jameco.com/Jamec…

Don't underestimate the placebo-effect of having a Dyson, regardless of it's physical effects. This is what you can do with a premium brand.. only a Dyson is like a Dyson

Don't underestimate the bad mouthing effect of having a Dyson. Relatives, neighbours and friends will be making judgements. Because everyone has an opinion on Dyson they will gossip. Might as well join a religious cult.

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

#534

Post by ahaucnx »

IgorPartola wrote: post #315
Karawebnetwork wrote: post #308

Earlier quoted context omitted.

> 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…

Thanks for mentioning our DIY sensor building instructions. Can you please let me know what exactly is outdated so that I can update it. Also I am more than happy to give people trial access to our dashboard. Just PM me via the support form on our website.

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

#535

Post by glenneroo »

t-writescode wrote: post #522
bluGill wrote: post #163

Earlier quoted context omitted.

I'm more worried about the random friend who drops by. Sure we wear a mask, but when can we take it off when they are gone?

I’m not a doctor, but isn’t this a lost cause? The masks we all wear are primarily droplet guards, not air filters, they catch splatter that might float. All of the air that blasts out the back and escapes is barely going to be diverted by another mask after it’s already escaped the other mask and has had time to exist, right? I guess for my threat analysis, if you’ve already invited them inside your house and they’v…

> I guess for my threat analysis, if you’ve already invited them inside your house and they’ve stayed long enough that you think their breath particulates are floating in the air, you’ve already lost the war, so to speak.

That's why ventilation is important if you are sharing a room with other "external" people.

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

#536

Post by IgorPartola »

ahaucnx wrote: post #534
IgorPartola wrote: post #315

Earlier quoted context omitted.

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…

Thanks for mentioning our DIY sensor building instructions. Can you please let me know what exactly is outdated so that I can update it. Also I am more than happy to give people trial access to our dashboard. Just PM me via the support form on our website.

Hey! I actually emailed you when I started but haven’t heard back so I assumed the project was not being worked on.

The biggest thing I found was that the PMS sensor has seen two generations of revisions. I built an original AirGradient and it’s sitting on my night stand currently but for new builds I am using a PMSA003 instead of PMS5003. Also I am substituting a DS-CO2-20 from Plantower for the CO2 sensor. That CO2 sensor seems to be well regarded and is slightly cheaper. And lastly I rewrote the drivers to be a bit different and a little more organized/readable/efficient. It doesn’t add much in terms of functionality, was just an excuse to write some C but I think it came out nice.

I redesigned the PCB to tie the PMS sensor’s SET and RESET pins to 3.3V per the data sheet. It seems to work fine without that with the PMS5003 but I haven’t yet received the new PCBs so I don’t know how it’ll work out. The PMSA003 has a different, slightly more convenient 1.27mm 2x5 connector so it’s easy to mount and get all the connections onto a PCB but isn’t breadboard friendly.

One other difference is that I’m not using a the Wemos OLED shield in favor of a stand-alone 0.96” OLED screen for double the resolution horizontally (your instructions show that one but not in the PCB build). And I wrote a different UI for it, plus added a button the PCB to do things like reset the sensor settings.

There are probably other things I’m forgetting but my email is in my profile if you want to move this conversation to that medium and once I polish up the code a bit more I am happy to share it. I will likely continue using these sensors with HA but I see no reason that you can’t use some of this in your work if you find it useful. I was planning on publishing the code and plans under a BSD license.

Overall, I wanted to thank you for the amazing work you did on AirGradient. I wouldn’t have been able to start on this project nearly as easily without your plans and code. It’s really impressive work very polished.

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

#537

Post by mPReDiToR »

brian_cunnie wrote: post #488
tw04 wrote: post #435

Earlier quoted context omitted.

Plenty of people need to rethink their parenting then. I laugh when my kid falls down. I scream when I saw my kid trying to stick a key into an electrical outlet, and I screamed when I saw my kid trying to put a finger into a vornado fan. Modern fans aren't the same as the box fans we grew up with. And adult would likely walk away with an emergency room bill and a bunch of stiches. A small child would likely lose a f…

I didn't put a key in an electrical outlet, but in Paris when I was a kid I was having trouble sticking the plug in the 220V outlet so I held it tight by the prongs & plugged it in & boy did that feel weird. I never did that again. I never told my parents about it because I would have gotten yelled at. At camp we put crickets on the electric fence, but nothing happened to them, so I grabbed the electric fence, and th…

Some childhood anecdotes...

One xmas when I was less than 5yo I jammed a knife into our 240v socket and blew the fuse on the Electricity Board side of the fusebox. They had to send an engineer out to turn the power on so we could continue cooking the turkey.

The other is from a sibling comment. With primary school, 10 years old, we went to the Lake District and were introduced to electeic fences by everyone holding hands with the person next to them, and the teacher explaining that he would touch the wire with the back of his hand to avoid muscle contraction. Because I was "that kid" I was placed at the far end of the chain, where I assume it tingled more. That was fun.

We used to put PP9 batteries on our tongues for tingles. Just for fun.

I do recall dangerously letting .22 blanks off with a brick and a piece of brick making an entry and exit wound through the outside fleshy part of my hand. Couldn't let mum know that I was even bleeding in case she asked why!

Touching the wires hanging out of the wall where the clock hung was fab, until I flew across the room and sat on the sofa unexpectedly. You really do learn respect for insulation at this point.

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

#538

Post by IgorPartola »

Normal_gaussian wrote: post #526
IgorPartola wrote: post #315

Earlier quoted context omitted.

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…

are you able to share anything / willing to work with anyone? I'm just getting through the research phase and am looking to coat my house with sensors - its been a struggle finding quality writing in the research and it looks like a graveyard in the world of pcb design.

Absolutely. See my reply to the sibling comment and shoot me an email (in my profile). Happy to share what I found out.

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

#540

Post by tremon »

kwdc wrote: post #515
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.

> designed to not sever fingers Where is the fun in that? I say sharpen the blades and make it a real teaching moment.

Only the worst teachers teach by maiming.
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