General > General Technical Chat
air filtering
Halcyon:
I've actually been looking into air purification for my home for quite some time and had a discussion with Dave about it. Just a week ago, I settled on two Dyson units. Over here in Australia they are known as the "HEPA Cool Formaldehyde" models but I think elsewhere they are marketed as the Dyson TP09 model. https://www.dyson.com.au/for-business/air-treatment/hepa-cool-formaldehyde
At the moment in Australia, these are only available to business/commercial buyers direct from Dyson.
I was looking at the larger Blueair units but settled on the Dyson for the following reasons:
* The Dyson cost me AUD$618 per unit versus AUD$1699 for the Blueair Classic 680i (shipped).
* The Dyson TP09 has a similar air handling/filtering capability compared to the Blueair model.
* The Dyson is slightly quieter at maximum fan level.
* The Dyson filters are cheaper at AUD$99 versus AUD$175 for the cheapest Blueair filter set.
* The Dyson filters are a combined HEPA/Carbon filter. This is a AUD$275 option on the Blueair model.
* The Dyson models are compatible with Home Assistant server. Blueair isn't and you need to rely on their app.
* WiFi can be completely disabled on the Dyson and two infrared remote controls are included in the box.
* The physical footprint of the Dyson unit is much smaller.
* The Dyson TP09 destroys any Formaldehyde in the air as opposed to simply capturing it in the filter material.
* Dyson has a much bigger presence and better customer support in Australia compared to Blueair.
* The Dyson will filter particular matter down to 0.1 microns (same as the Blueair filters).
* There are 10 fan speed settings on the Dyson whereas the Blueair only has 3.
I'm fortunate enough to live in a part of the world where clean air is "normal" and even expected, but there are still times where dust, pollen and bushfire smoke can impact indoor air quality.
On a "normal" day, both my Dyson units report the following figures with windows closed:
0-1 µg/m³ of both 2.5 and 10 micron particulate matter.
Nil VOCs
Nil Nitrogen Dioxide
Nil to 0.002 mg/m³ of Formaldehyde
Even cooking something will send the VOC levels peaking quite quickly. I've found they work best with the ducted air circulating air around the house (the return air has its own filter which seems to be quite effective at filtering particulates). I've placed one unit in the master bedroom and the other in the main open plan living area. I mostly just leave them on the full-auto mode (with continuous monitoring enabled) so they ramp up when they need to.
Continuous monitoring is a feature (that is disabled by default) that runs the fan continuously at very low speed, just enough for all the sensors to sample the air. It also reports this data constantly in the app.
engineheat:
--- Quote from: Halcyon on August 11, 2021, 05:59:08 am ---I've actually been looking into air purification for my home for quite some time and had a discussion with Dave about it. Just a week ago, I settled on two Dyson units. Over here in Australia they are known as the "HEPA Cool Formaldehyde" models but I think elsewhere they are marketed as the Dyson TP09 model. https://www.dyson.com.au/for-business/air-treatment/hepa-cool-formaldehyde
At the moment in Australia, these are only available to business/commercial buyers direct from Dyson.
I was looking at the larger Blueair units but settled on the Dyson for the following reasons:
* The Dyson cost me AUD$618 per unit versus AUD$1699 for the Blueair Classic 680i (shipped).
* The Dyson TP09 has a similar air handling/filtering capability compared to the Blueair model.
* The Dyson is slightly quieter at maximum fan level.
* The Dyson filters are cheaper at AUD$99 versus AUD$175 for the cheapest Blueair filter set.
* The Dyson filters are a combined HEPA/Carbon filter. This is a AUD$275 option on the Blueair model.
* The Dyson models are compatible with Home Assistant server. Blueair isn't and you need to rely on their app.
* WiFi can be completely disabled on the Dyson and two infrared remote controls are included in the box.
* The physical footprint of the Dyson unit is much smaller.
* The Dyson TP09 destroys any Formaldehyde in the air as opposed to simply capturing it in the filter material.
* Dyson has a much bigger presence and better customer support in Australia compared to Blueair.
* The Dyson will filter particular matter down to 0.1 microns (same as the Blueair filters).
* There are 10 fan speed settings on the Dyson whereas the Blueair only has 3.
I'm fortunate enough to live in a part of the world where clean air is "normal" and even expected, but there are still times where dust, pollen and bushfire smoke can impact indoor air quality.
On a "normal" day, both my Dyson units report the following figures with windows closed:
0-1 µg/m³ of both 2.5 and 10 micron particulate matter.
Nil VOCs
Nil Nitrogen Dioxide
Nil to 0.002 mg/m³ of Formaldehyde
Even cooking something will send the VOC levels peaking quite quickly. I've found they work best with the ducted air circulating air around the house (the return air has its own filter which seems to be quite effective at filtering particulates). I've placed one unit in the master bedroom and the other in the main open plan living area. I mostly just leave them on the full-auto mode (with continuous monitoring enabled) so they ramp up when they need to.
Continuous monitoring is a feature (that is disabled by default) that runs the fan continuously at very low speed, just enough for all the sensors to sample the air. It also reports this data constantly in the app.
--- End quote ---
Do you know if the Dyson HEPA filter contains fiberglass? I heard those with fiberglass can leak fiberglass fibers.
engineheat:
--- Quote from: NiHaoMike on August 11, 2021, 03:16:14 am ---
--- Quote from: engineheat on August 10, 2021, 05:14:32 pm ---Regardless of the type of fan used, it should be "ducted" or sealed around the edges for maximum air pressure right? I'm only familiar with "normal" fans. Can you provide a bit info on the cage/wheel type blower so I can look into those?
--- End quote ---
Those are most common in HVAC equipment. However, most of those use PSC motors which are less efficient than BLDC motors (and BLDC motors in HVAC equipment often use some proprietary interface that makes them more difficult to repurpose), so unless you really need to move a lot of air (which won't be the case for getting a little fresh air), 120mm BLDC fans would likely be the best value. Look for the ones with director vanes, which boost the static pressure.
--- End quote ---
What does "director vanes" mean? Thanks
Halcyon:
--- Quote from: engineheat on August 11, 2021, 03:54:16 pm ---Do you know if the Dyson HEPA filter contains fiberglass? I heard those with fiberglass can leak fiberglass fibers.
--- End quote ---
It appears so. According to their website the PM filter material is made from borosilicate microfibres. I'd say it's not unlike a lot of filter material. I'm sure they've done their homework. I've never heard of the filters breaking down in such a way that would cause them to impart impurities into the air. Maybe some cheap filters from China of dubious quality would do that? I'd say if you're buying an expensive filtration device, you should also be buying the genuine filters. $100 per unit every 6-12 months is hardly a lot of money.
NiHaoMike:
--- Quote from: engineheat on August 11, 2021, 03:57:53 pm ---What does "director vanes" mean? Thanks
--- End quote ---
Those are stationary vanes that direct the air to come out exactly perpendicular to the fan itself, converting the spin imparted by the blades into more static pressure. Here's an example of a fan with them:
https://www.newegg.com/p/1YF-00B0-00JW6?Item=9SIAAESD2T6194&Description=120mm%20delta%20fan&cm_re=120mm_delta%20fan-_-9SIAAESD2T6194-_-Product&cm_sp=SP-_-518473-_-0-_-1-_-9SIAAESD2T6194-_-120mm%20delta%20fan-_-120mm|delta|fan-_-12
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