Air purifier? - Part 2

[wongminmin]

Lol is it me I see wrongly or what, yesterday's price was at $139 for 2S, however, today it increased to $159-$179?

yes they increase the price since yesterday evening...., supply Vs. demand. Some have ran out of stock...but still taking as pre-order.

Minihelpers sold another 70 sets today. people are willing to buy at higher price.
Now the question is whether the sellers have enough ready stock to handle the current surged demand.

Hopefully, this haze only lasts 1 week or so.

 

[frizee]

yes they increase the price since yesterday evening...., supply Vs. demand. Some have ran out of stock...but still taking as pre-order.

Minihelpers sold another 70 sets today. people are willing to buy at higher price.
Now the question is whether the sellers have enough ready stock to handle the current surged demand.

Hopefully, this haze only lasts 1 week or so.

Wait so my eyes aren't playing tricks on me!?!?!?

Really increase price ah! OMG...

 

[flambe]

Looks like you are not a regular user, what whitesands recommended is ok and convenient.

For those who are daily users and have multiple AP units (other than the AX40) and want to change it every 6-9 months (you know, the filter smells after a while) and want an even more economical option, just go to Taobao and type DIY HEPA, choose those which are 300mm x 300mm x 2.5cm. The Samsung AX40 is 320mm x 285mm in L and W.

Slice the HEPA up to fit the 285mm dimension first, slice the filter so that it goes "along the grain", it's much easier to cut this way and less messy.
For the other dimension, roll up a bit of the plastic wrapping that comes with the filter and stuff it into the gap between the filter and the walls of the AX40 (since this one is 320mm for the AX40 and filter is only 300mm, hence 25mm gap).

Don't worry too much about the gaps and whatnots affecting the air quality due to bypass (it's very very little only), it'd still have decent CADR and clean the room's air of haze very nicely. The filter's filtration output is about 90-95%, so that is about H10 to H11.
I have confirmed with the laser particle counter, HDB room can still be cleaned. The drop in airflow velocity is noticeable, CADR shd be around 200-230 m3/hr, so still no issue one.
Another good thing is that the due to the lower airflow (due to increased filter resistance), it sort of is a manual medium speed.......so it's even more silent than the original filter at high speed.
I find that for regular use, this 200-230 m3/hr CADR with even more silent operation is fine, not that the orignal filter at 323 m3/hr high speed is noisy.


his is one of them.
https://item.taobao.com/item.htm?sp...LMm0o&id=558805128135&ns=1&abbucket=12#detail

 

[meesoto]

Recommend single AP for larger room

Hi,

[Yes, I've read the whole thread and then some. ]

I'm in the market again for a new AP or APs. This would be for a medium to large room(s). My existing Samsung AX40s will be a little underpowered in terms of CADR. I'm thinking around 500 m3/hr would be good since I'm going to run it in Med mode most of the time.

Any recommendations for the current picks? I would prefer not to get Xiaomi Pro as it requires an online connection unless there's a way to operate it without the Mi Home app?

Of course, the most important thing is filter replacement costs as we all know that's the real killer over the long term.

So,

1. Ease, price and availability of filters (original or generic).
2. Cost of AP unit.
3. Preferred tested brands (Chinese ok).


Thanks.

 

[flambe]

Another just as important factor is the external loading. Quite a few of us with meters experienced the true impact last year with the 2015 indon haze (China gets to levels significantly higher even).


Give example. Meter shows this, which is very high a level.

Note the meter on the right. 1119.
In a approx 30m3 room which is like the size of a 4-room BTO living room which is pretty leaky from the room's toilet which has a 15x20cm hole and plastic folding doors with big gaps below and the 2 windows made up if non-airtight metal panes, plus door has big gaps below, a 319 m3/hr Midea air purifier was only able to clean this down to about 200. Or 82% drop


In another room, this 319 m3/hr Midea AP + a Sharp A40 with 210 m3/hr or total of 530m3/hr managed to clean the air to about 70. Or 91% drop. But also, the windows are sliding type with rubber gaskets, and no toilet. Door has same big gap below.

High external loading is no joke. Really need to plug the leaks, of coz not to the extent of 99.9% tight such that CO2 levels also rise until buay lin chu.

where u buy the meter ar?

 

[WussRedXLi]

where u buy the meter ar?

Taobao. Nowadays there are more variants and products already.

Get the sensors that are using laser. Don't get the IR LED ones.

 

[MIVEC525]

Taobao. Nowadays there are more variants and products already.

Get the sensors that are using laser. Don't get the IR LED ones.

Any link? My chinese no good.....

 

[WussRedXLi]

Hi,

[Yes, I've read the whole thread and then some. ]

I'm in the market again for a new AP or APs. This would be for a medium to large room(s). My existing Samsung AX40s will be a little underpowered in terms of CADR. I'm thinking around 500 m3/hr would be good since I'm going to run it in Med mode most of the time.

Any recommendations for the current picks? I would prefer not to get Xiaomi Pro as it requires an online connection unless there's a way to operate it without the Mi Home app?

Of course, the most important thing is filter replacement costs as we all know that's the real killer over the long term.

So,

1. Ease, price and availability of filters (original or generic).
2. Cost of AP unit.
3. Preferred tested brands (Chinese ok).


Thanks.

There are some chinese APs with very high CADRs, 600, 700++ m3/hr. I posted them before on pages not more than 50 pages before this, during the Malaysian Pasir Gudang haze. Take a look there.

eg

https://detail.tmall.com/item.htm?s...260b3233664c920f&abbucket=4&scene=taobao_shop


Or you can consider the Xiaomi Max. 1000 m3/hr CADR.

https://detail.tmall.com/item.htm?spm=a230r.1.14.22.46a97533W4pRdt&id=563741860906&ns=1&abbucket=1


Anyway, the video made a mistake. The H11 in the Xiaomi Max doesn't matter, the CADR already has taken that into account, it's the lab tested figure in a room in which the time it takes to drop a certain concentration to a certain concentration. CADR (Clean Air Delivery Rate) is what matters.

d

 

[mindgamey]

where u buy the meter ar?

I am using this.

https://shop.hellowynd.com/collections/products/products/wynd-air-quality-tracker?variant=33510898510

Smaller and less bulky.

 

[Globe]

anyone using this brand call trusens ?

 

[~WindzStriker~]

i see that in this thread, at least for the more recent replies, people are swinging towards Xiaomi, no matter it is Xiaomi 2s, 3 or Pro.
I went to taobao to take a look, correct me if I am wrong here.

their filters types only have 3 types, the green, blue and anti bact Purple.
All of them even the hepa ones are not True Hepa...

if it is not true hepa, why buy xiaomi ?
genuinely curious on this. or people really dont care hepa vs true hepa filters ?


Local brands like Novita, the more expensive ones of cause, around $399, $505 types are True Hepa filters.

another brand i am looking at will be EuropAce EPU 3501S, but no info on air flow rate. and EuroApace brand i dont have good experience with the brand though

 

[optimus_prime888]

https://betterairus.com/

World's first air and surface probiotic purifier!

All other 'traditional' air purifiers can stand one corner liao

 

[yamakazi51]

https://betterairus.com/

World's first air and surface probiotic purifier!

All other 'traditional' air purifiers can stand one corner liao

Lol, want to see how this is going to handle haze type of pollutants

 

[Presto80]

Saw the post above regarding non true hepa.

Is the h11 related to the non true hepa?
Does it matter if it is non true hepa, in this case for xiaomi?
Thanks

Or you can consider the Xiaomi Max. 1000 m3/hr CADR.

https://detail.tmall.com/item.htm?spm=a230r.1.14.22.46a97533W4pRdt&id=563741860906&ns=1&abbucket=1


Anyway, the video made a mistake. The H11 in the Xiaomi Max doesn't matter, the CADR already has taken that into account, it's the lab tested figure in a room in which the time it takes to drop a certain concentration to a certain concentration. CADR (Clean Air Delivery Rate) is what matters.

d

 

[mindgamey]

Saw the post above regarding non true hepa.

Is the h11 related to the non true hepa?
Does it matter if it is non true hepa, in this case for xiaomi?
Thanks

Everything is about CADR, clean air delivery rate.

Roughly in theory CADR = air flow x filtration efficiency

Doesn't matter if the filter can remove 100% of the dust if the air flow sux.

Just look at Dyson purifier fan, they keep harping on their best filter but their airflow is poor since there is a huge bypass. That's why they don't publish CADR.

 

[athenodorus]

Everything is about CADR, clean air delivery rate.

Roughly in theory CADR = air flow x filtration efficiency

Doesn't matter if the filter can remove 100% of the dust if the air flow sux.

Just look at Dyson purifier fan, they keep harping on their best filter but their airflow is poor since there is a huge bypass. That's why they don't publish CADR.

True hepa can eliminate smokes, odours, and some airborne allergens which those normal hepa filter could not.

If possible, get one with true hepa.

 

[Lucky177]

If main concern is to reduce PM2.5, H11 or “true HEPA”, both works.

Used to have Coway, Honeywell, Hitachi, Sharp AP.

Of course if money is not an issue in changing filters, then go for whatever one think is the “best”.

 

[athenodorus]

If main concern is to reduce PM2.5, H11 or “true HEPA”, both works.

Used to have Coway, Honeywell, Hitachi, Sharp AP.

Of course if money is not an issue in changing filters, then go for whatever one think is the “best”.

So in the end what did you use now?

 

[Lucky177]

Now all Xiaomi pro. Good enough for me.

So in the end what did you use now?

 

[athenodorus]

Any reviews on novita nap866?