Air purifier which to buy?

[mrmicbkktxl]

I would like to buy an air purifier but have no idea which one to buy.At lazada the most sold brand is XPX,but it is very cheap makes me wonder if it really helping.

Also saw Xiaomi and Electrolux.Does anyone has experience with purifiers?What is the difference between a 20k and 700thb purifier?

[samtam]

9 minutes ago, mrmicbkktxl said:

What is the difference between a 20k and 700thb purifier?

 

THB19,300

[UWEB]

Some weeks ago have bought a Xiaomi 4 Pro for my Bedroom, works very good. Price was 7k THB.

[Doctor Tom]

 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.  

[mrmicbkktxl]

3 minutes ago, Doctor Tom said:

Unless it vents to the outside, it is next to useless.  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.  

If I set my aircon to dry it will stop after the huminidy is gone.I read somewhere those purifiers need to run 24/7

[samtam]

18 minutes ago, samtam said:

 

THB19,300

 

Sorry to be so flippant.

I have Xiomi. 

2 smaller ones in the bedrooms, and one large one in the living room.

As to their effectiveness, I have no way of measuring that, but there is a indoor air quality monitor device you can buy on Lazada to measure. 

[KannikaP]

28 minutes ago, 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.  

 

A 'normal' air-con, be it inverter or old style, DO NOT vent any air out of the room. They merely circulate the air whether cooling it, or de-humidifying it. The only thing which goes outside is the water which it extracts.

[mrmicbkktxl]

Just now, samtam said:

 

Sorry to be so flippant.

I have Xiomi. 

2 smaller ones in the bedrooms, and one large one in the living room.

As to their effectiveness, I have no way of measuring that, but there is a device you can buy an indoor air quality monitor. 

yeah,I have Sndway pm25 detector already.I have a few Xiaomi devices(phone,watch,scale) already and they work ok

[scubascuba3]

My Xiaomi air purifier was 3k last year, seemed to work well, air quality improved according to the display, i only use when bad, probably starting this month

[mfinasi]

If you already have Xiamoi devices make sure the version is the TH region, otherwise you'll have to remove all the devices and redo your Xiamoi setup to Chinese. Nearly all Xiamoi 4 ones on lazada are grey imports except from the two official stores. If you don't plan on using the app for scheduling you can probably get away with Chinese version. They always have sales on the big lazada days - next is 3/3/2024 if not in a rush. The 4 lite is sufficient for most rooms. 

[tomazbodner]

Air purifiers don't need to run 24/7. If you get Xiaomi (I have these so I'm confident, but I would bet some others have the same), they are Wifi connected and controlled from mobile phone. On the phone, you can select schedule, and if you take whole home automation set, with air quality sensors, you can make even a lot more detailed automation of when to run, like when you're on the way home, turn it on 30 minutes before you arrive, etc.

 

I have one air purifier in each room. Set the bedroom ones to work overnight, and living/working room ones to work over the daytime but turn off at night. That can be easily overridden if pollution outside is really bad and a single air purifier can't handle it by simply turning others on by app or touch button on the box.

 

I prefer Xiaomi not only because they are cheap, but because they have air quality sensors and display with current information, can be controlled from phone, and have easily obtainable filter cartridges which cost about 800-900 baht each and last (in my case) about 9 months with schedule enabled, or about 6 months if running 24/7.

 

One word of caution with XIaomi - they have global and China versions. They use different cloud locations. So if you have China version, all is in Chinese and App has to be set to mainland China. I have all items Global versions, so I can control them all from same app. You'd need 2 phones if you had a mix. Chinese versions are usually a little cheaper than Global version.

[Richard 2020]

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.

[Doctor Tom]

21 minutes ago, mrmicbkktxl said:

If I set my aircon to dry it will stop after the huminidy is gone.I read somewhere those purifiers need to run 24/7

The dry thing is true, but mine usually never switches off. Not sure about the 24/7 bit, but I dont see much point in running it if pollution levels are low. 

[Doctor Tom]

20 minutes ago, KannikaP said:

A 'normal' air-con, be it inverter or old style, DO NOT vent any air out of the room. They merely circulate the air whether cooling it, or de-humidifying it. The only thing which goes outside is the water which it extracts.

have you ever stood in front of an aircon outside.  An aircon is a heat exchanger and it does not just circulate internal air without an outside vent.  Its why portable aircons are a waste of money and never really work. 

https://www.youtube.com/watch?v=gVLhrLTF878

 

[mrmicbkktxl]

18 minutes ago, mfinasi said:

If you already have Xiamoi devices make sure the version is the TH region, otherwise you'll have to remove all the devices and redo your Xiamoi setup to Chinese. Nearly all Xiamoi 4 ones on lazada are grey imports except from the two official stores. If you don't plan on using the app for scheduling you can probably get away with Chinese version. They always have sales on the big lazada days - next is 3/3/2024 if not in a rush. The 4 lite is sufficient for most rooms. 

Yeah,I noticed that they sell  global and chinese versions I guess I have only global devices

[TallGuyJohninBKK]

There are several important features anyone looking to buy an air purifier in Thailand should consider:

 

1. It should be a HEPA or True HEPA purifier, meaning it's rated to remove 99.97% of PM2.5 down to 0.3 microns in size.

 

https://en.wikipedia.org/wiki/HEPA

 

2. It should be sized large enough to accommodate the room or open living space where it will be used. In other words, don't buy a purifier rated for handling a 20 sq mt room when the area you need to purify is 40 or 80 sq mt.

 

3. Make sure and identify for the model you're considering that there is a local and reliable supply of replacement HEPA filters for the unit in question, as HEPA filters typically need to be replaced every one year or so...depending on useage patterns. And the purifier you buy will be useless to you in the future if you can't source quality replacement filters sized for your unit.

 

Some of the reputable brands offered here include Hatari, which makes a relatively low cost model, Sharp, which also makes some affordable room sized purifiers, and Xiaomi, particularly their later 3 and 4 series models.

 

 

 

[lopburi3]

7 minutes ago, Doctor Tom said:

have you ever stood in front of an aircon outside.  An aircon is a heat exchanger and it does not just circulate internal air without an outside vent.  Its why portable aircons are a waste of money and never really work. 

https://www.youtube.com/watch?v=gVLhrLTF878

 

Are you serious - there is no circulation of air to the outside with a two piece air conditioner unit.  The old USA style window units had such (although not much) - they have not been used here for decades.

What goes outside is the hot coolant into fan coils and outside air is forced through to cool the coolant which returns to absorb more heat from inside.

[Rimmer]

We have Xiaomi from Lazada, works well

[PingRoundTheWorld]

Doesn't matter which brand you buy- make sure of a few things:

1. It has at minimum both a HEPA filter (for dust etc) and an active charcoal filter. (for smells, smoke, etc). I recently bought an Imarflex IF-067R, and was surprised to learn after-the-fact that it doesn't have a carbon filter. It does double as a fan which is a nice feature that oddly most manufacturers lack.

2. Size does matter - choose the right size for the room(s) - there's plenty of generic ones on lazada that are very cheap but are actually desktop size and don't really do much except look pretty.

3. Xiaomi is a bit pricier but it does work very well provided the fan is set to a high enough level. On low mode it's pretty silent but doesn't do much - on high mode it filters great but sounds like a vacuum cleaner. Probably best to alternate the two depending on whether you're in the room.

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.

[lopburi3]

Have found Sharp units under 3k to be both very effective, high air flow, low noise and easy to obtain filters.  And use 24 hours a day without issues.

[PingRoundTheWorld]

4 minutes ago, TallGuyJohninBKK said:

HEPA filters typically need to be replaced every one year or so

My experience has been every 6 months running them 24/7. Also keep in mind that charcoal filters need to be replaced every 1-2 months to actually be effective - but no one replaces that often. If PM2.5 is your main concern every 6 months would work.

 

As for Hatari- I bought one which arrived DOA. Turned on for about 5 seconds before burning out. Trashed it and got the exact same purifier, but from Imarflex - which works. I think eventually I'll go back to Xiaomi as they're more effective depending on the noise level.

[TallGuyJohninBKK]

1 hour ago, mrmicbkktxl said:

At lazada the most sold brand is XPX,but it is very cheap

 

I've never heard of this name/brand at all when it comes to air purifiers.  There's probably a reason it's "very cheap."

 

[ezzra]

BlueAir pure 511 highly recommended for samll spaces..

 

 

https://www.livescience.com/health/blue-pure-511-review

[TallGuyJohninBKK]

3 minutes ago, lopburi3 said:

Have found Sharp units under 3k to be both very effective, high air flow, low noise and easy to obtain filters.  And use 24 hours a day without issues.

 

I've had one of those Thai-purchased Sharp models (FP-F30

TA and similar) at home in BKK for the past several years, and it's worked flawlessly and effectively. But their units in that price range, I believe, are only sized for a room of about 20 sq mt...  So great for a bedroom and such, but not a single unit for an entire home or larger condo.

 

[KannikaP]

13 minutes ago, Doctor Tom said:

have you ever stood in front of an aircon outside.  An aircon is a heat exchanger and it does not just circulate internal air without an outside vent.  Its why portable aircons are a waste of money and never really work. 

https://www.youtube.com/watch?v=gVLhrLTF878

 

Sorry but you are wrong. The heat felt from the outside unit is the heat extracted by the refrigerant and dissipated by the radiator and fan in the outside unit.

NO air from inside the room where the inner unit is fitted goes outside. Watch the video again, and read lopburi's answer.

Portable aircons are, as you say, useless because the heat extracted from the room just stays in the room.

[Furioso]

I'm happy with the Xiaomi Air Purifier 4 for 2,500 baht. Good for 40 sqm. room. The app tells me the AQI(currently 13) and says my filter is currently at 68% after 8 months. If I turn it off the AQI usually measures in the low 20's. 

[TallGuyJohninBKK]

29 minutes ago, PingRoundTheWorld said:

My experience has been every 6 months running them 24/7. Also keep in mind that charcoal filters need to be replaced every 1-2 months to actually be effective - but no one replaces that often. If PM2.5 is your main concern every 6 months would work

 

 

As I  said above, depends on usage....

 

For me here in Bangkok, air pollution is really only a major problem during the burning season, typically Nov-Dec to Mar-April. That's the period when there's the most gunk in the air, and accumulating on your HEPA filter...

 

Also, there's steps you can take to extend the life of the HEPA filter. For example, my Sharp unit came with a back cover that serves as a pre-filter, keeping the larger particles away from the HEPA filter. And that back pre-filter can be easily removed and rinsed clean indefinitely.

 

Also, I added my own hand-cut carbon filter sheets inside my Sharp unit between the pre-filter and HEPA filter. And the carbon filter sheets also catch stuff that makes it thru the pre-filter, further protecting the HEPA filter. Those carbon filter sheets are relatively cheap. They cannot be washed. But they can be vacuumed with HEPA hand vac or HEPA house vac to extend their life.

 

[PingRoundTheWorld]

3 minutes ago, TallGuyJohninBKK said:

Also, I added my own hand-cut charcoal filter sheets inside my Sharp unit between the pre-filter and HEPA filter

Got a link to those? sounds like it might help with my Imarflex unit (that doesn't have a charcoal filter).

[TallGuyJohninBKK]

20 minutes ago, PingRoundTheWorld said:

Got a link to those? sounds like it might help with my Imarflex unit (that doesn't have a charcoal filter).

 

I buy carbon prefilters from Amazon in the U.S. and have them mail forwarded here... In the past, I've often bought a particular size made by Honeywell for a particular large/house sized Honeywell purifier I have at home. But these days, there are multiple quality suppliers of those sheets on Amazon... It's kind of a commodity product, unless you need one of an unusual size.

 

FWIW, I've never really looked to see if the same are available here in Thailand. The Honeywell ones fit my Honeywell purifier, and the leftover/trim from those I hand cut to fit in the rear of my Thai purchased smaller Sharp unit.

 

Examples:

 

https://www.amazon.com/dp/B003UH9I2G/

 

https://www.amazon.com/dp/B01MQR1W51/

 

PS - One of the disadvantages of the Xiaomi units, IMO, is that their filters are of the one-piece cartridge style... as opposed to having separate HEPA and pre-filter and-or carbon sheets...

 

To me, being able to replace/clean the separate pre-filter and cheap carbon filters more often allows you to extend the life of your more expensive HEPA filter.... vs having to replace it more often when you're using the all-in-one variety. The manufacturers, if it wasn't already obvious, generally make their money off the HEPA filter replacement sales more than off the original units.

 

And one interesting feature that Xiaomi has had, at least on past models, was an electric mechanism on their units that checks to insure that the installed HEPA filter is one made by Xiaomi, as opposed to any third-party source.

 

 

[Tom100]

I got the Hatari air purifier model AP12R1, room size 32 sq m

Under 3000 on Lazada