Air purifier which to buy?

[scoutman360]

I appears the Xiaomi popular models such as Xiaomi 4 Pro on Lazada are currently "pre-order" with 7 to 30 days delivery.  And very few offering the global version. Mostly China version available. 

[JRG23]

Xiaomi very good. I have three, all excellent, very durable

[Unify]

https://airdeveloppa.co/th/

[kimothai]

On 2/16/2024 at 1:06 PM, Richard 2020 said:

Just under 33,000 THB is already very ambitious!

Just like everything else from this company!

 

The XIAOMI devices only cost about 20% of what DYSON charges, plus the increased power consumption of the Dyson devices!

Is the Xiaomi filter better than HEPA?

In order for the HEPA filter to emit more clean air, the motor has to run at a higher speed, which results in higher energy consumption.

With a lower fiber density, the Xiaomi filter is able to emit the same amount of clean air as a conventional filter, but with a significantly lower energy consumption.

Caution when buying a Dyson Product.  Service for repair is slow IMHO.  I have the purifier pictured above and it developed a fault after about a year and a half, so I took it to the dept. store where I purchased, and they sent it to the Dyson repair center.  Was quoted a price and a wait time of 4 (four) Months.  At the 4-month marked we called, and they said they still don't have the part (after 4 months) and it will be another month or two months and oh by the way "so sorry".  I'm still waiting as of this writing.  I don't think I'm the exception because I had a friend return a stick vac that needed repair, and it took in excess of 4 months before he got it back.  I think the Dyson products are very good but I'm less than happy about the wait time if repairs are required. 

[Yellowtail]

24 minutes ago, kimothai said:

Caution when buying a Dyson Product.  Service for repair is slow IMHO.  I have the purifier pictured above and it developed a fault after about a year and a half, so I took it to the dept. store where I purchased, and they sent it to the Dyson repair center.  Was quoted a price and a wait time of 4 (four) Months.  At the 4-month marked we called, and they said they still don't have the part (after 4 months) and it will be another month or two months and oh by the way "so sorry".  I'm still waiting as of this writing.  I don't think I'm the exception because I had a friend return a stick vac that needed repair, and it took in excess of 4 months before he got it back.  I think the Dyson products are very good but I'm less than happy about the wait time if repairs are required. 

When you buy consumer good, only buy popular stuff. 

[scubascuba3]

I have a Xiaomi, seem to work but unless you move it around it's hard to know whether it's filtering all the air or just the air by the purifier 

[ujayujay]

On 2/16/2024 at 12:39 PM, Doctor Tom said:

 The best option is having one integral to your aircon. Most modern inverter aircons will have some air purifier options incorporated, some more than others.  Mine, set on 'dry' rather than 'cool', seem to be very effective.  

No, dry mean dehumidifier and has nothing to do with air purification. Generally, air conditioners cool the existing air and do not produce new fresh air!

[Yellowtail]

19 hours ago, ujayujay said:

No, dry mean dehumidifier and has nothing to do with air purification. Generally, air conditioners cool the existing air and do not produce new fresh air!

But most all air-conditioners have integrated air filters. 

[TallGuyJohninBKK]

Most traditional AC units sold here still don't do a meaningful job of eliminating indoors PM2.5, which is really where the focus should be, from a health perspective. "True" HEPA air purifiers are best for that job.

 

 

[Yellowtail]

I have three Daikin MC80ZV1S air purifiers. These, as far as I know are the most powerful consumer model available in Thailand. They are rated for 62m^2 room, and have a max airflow rate of 480m^3/hour

 

The Daikin BTU Calculator estimates a 57,000 BTU AC unit for a 64m^2 room, 

 

A typical 60,000 BTU air conditioner has ~ a 2,300m^3/hour max airflow rate.

 

A typical 18,000 BTU air conditioner has ~ a 1,700m^3/hour max airflow rate.

 

Assuming 3m ceiling height:

The top-model purifier does 2.5 air-turns an hour. 

The 60,000 BTU AC does ~12 air-turns an hour. 

The 18,000 BTY AC does ~9 air-turns an hour. 

 

Many of the newer air conditioners have 2.5PM filters. 

 

 

 

 

[TallGuyJohninBKK]

Effective PM2.5 reduction is not only a matter of the clean air flow delivery rate, but also the type and quality of filter being used. "True" HEPA filters eliminate 99.97% of PM2.5 at the filter point. There are lots of lesser quality, less effective filters including some labeled as HEPA that do a much poorer job of capturing/eliminating PM2.5.

 

Also, there's the issue of electrical use and economy. Air purifiers by and large use far far less electricity than split air con units do. You can run an air purifier around the clock and not rack up any big electrical charges. But running a large room air con unit around the clock just because you're trying to filter PM2.5 is really going to spike one's electrical bill by comparison.

 

 

 

[BangkokHank]

On 2/16/2024 at 1:22 PM, PingRoundTheWorld said:

4. If you do choose Xiaomi, the air comes out on top which is kind of inconvenient - they do have accessories to redirect the air so you can actually point it where you want but you have to buy that separately.

Can you provide further information (perhaps via a link) for this accessory to redirect the air from a Xiaomi air purifier? Thanks.

[BangkokHank]

On 2/17/2024 at 6:22 AM, Thaddee said:

There is a Chiang Mai company that, in cooperation with Chiang Mai university and some German engineers, has created a simple et effective air purifier. No frills, no extra electronic sensors and gadgets but effective and quite silent. Last year they ran out of replacement filters but they might have prepared more for this season. Check out their website https://airdeveloppa.co/ Their air purifier works great at a fraction of the cost of a Xiaomi.

Thanks very much for this suggestion. I bought one of them based on your comments (they can be bought through Lazada as well, which is what I did), and I am very satisfied with it. It is, as you say, a no-frills device. I consider it to be a very elegant solution to the air quality issue. After all, an air purifier is essentially a filter and a fan. I must say that it is quite noisy when it is turned up all the way, but it is fairly quiet on its mid-range setting. So I only turn it up all the way when I am out, and when I am home I keep it on half speed. It cost me around 1,800 baht including delivery, which is a fraction of what the other devices cost. And it uses the Xaomi filters, which are readily available. (Basically, it's a nicely designed fan on top of a Xaoimi filter.) Thanks again for the suggestion.