The unit has different fan speeds. The highest one is quite loud and blows a lot of air through the unit. In the low mode, the unit whispers away and for me, as "it has to be quiet", it is very pleasant. The airflow is therefore very low. The air is also ionised. So far, I have not been able to feel any direct benefit.
This cannot be said at the moment, as we do not have a delivery date from the supplier for the next delivery. As soon as this changes, the new date will be posted. Please note that the date in your order may be different from the date in the shop.
Not in Auto mode. For this to happen noticeably, it must run at the highest level throughout so that the room air is constantly circulated. This would not be recommended.
The devices are compatible with Android and Alexa, but not for Homekit. Apple is very limited with Smarthome, not many products are compatible, but the Air Purifier 4 can also be operated in automatic mode, it does not need a connection to an app. You can make all the settings on the device itself, I would recommend the automatic mode anyway, because then you are also sure that the air is always cleaned.
Either you have the Digitec websites cached on your mobile or PC (or a proxy with an old cache behind it) or Digitec has dynamic prices. But Digitec knows that better than I do. But it's nothing new that Digitec's prices change like the exchange rates on the stock exchange.
Contrary to the positively expressed opinion of others, I find the noise that the part makes in night mode and level 1 really annoying, i.e. I hear the even clearly visible imbalance of the apparently only cheap plastic fan wheel - which possibly bends differently depending on temperature and humidity, which steel would not do so much and of course would also be more durable.ergo, it doesn't make a continuous sound, but a constant up and down--taken exactly, probably back and forth, Doppler effect and blaaa--with every rotation, is this the same with you--I'm only talking about level 1 and night mode, just to make it clear again, since somehow you always get answers to everything else here than you actually asked--?
It's "quiet" in itself, but it's not a constant, unobtrusive, bearable sound, but rather an annoying "up and down" sound. Do you also notice this with your device, or do I have a model that I should possibly return? 0.o
If I look at the edge of the fan wheel from above, I can even see how the thing is wobbling -- of course less than a millimetre, but still--, so I think that with today's industrialisation, you shouldn't be able to get fans that aren't perfectly round and unbalanced.So I just wanted to ask you quickly, do you also see this with your devices, how the edge always moves in and out a bit to match the annoying sound it makes at the slightest steps?
Do you have to accept this on a "Pro" model nowadays? 0.o It doesn't do me --and the pollution-- any good to go through the whole return procedure and then get back a device that is exactly the same - or, as is so often the case, even shittier, if they were all like that...
@Galaxus & @Digitec: For such cases it would be useful if you could post audio or video files here, so that others could compare it with their device, or that you can hear samples from others before you even buy a device! ;)
If the fan has an audible imbalance at low speed, then there is something wrong with the unit and it should be replaced. I have been using these air purifiers for many years and they have to be absolutely quiet in the automatic mode, nothing should hum or rattle.
However, I have already had two such air purifiers that made a humming noise for a few seconds at intervals of about 10 - 15 minutes, even when they were switched off. However, this did not come from the main fan but from the small fan that is installed in the particle measurement sensor. At first I couldn't explain where this noise was coming from, but then I found the references to the particle measurement sensor on the Internet. I ordered a new sensor from Aliexpress, which is super easy to replace, and since then it has been quiet again.
Back to the problem with the imbalance, something is wrong and the unit should be replaced. They should not be audible in the low setting. If the air purifier can be heard for a few seconds at intervals of approx. 10 - 15 minutes (sounds like an up and down hum), then it is the small fan in the particle measurement sensor. I would change the unit and then take the normal Air Purifier 4, the Pro is not absolutely necessary. Maybe even two 4 Lite are better, I also use two (older 3H), one is in the living room and one in the bedroom.
@Galaxus / @Digitec:
This device has unfortunately a damn disadvantage compared to the much too expensive Dyson's, namely that it is only a filter, and not at least a fan and filter --ideally also a dehumidifier would have been great-- in one, but in the search for solutions to the problem, where I would have expected in the 3D printer scene.I found this elegant finished product, which would make the Mi Air Purifier 4 Pro a bit more useful, so can you by chance stock something like that?
TLDR version:
https://www.youtube.com/watch?v=BxkNOkw076E
Version where also the downsides are pointed out, namely that it won't blow like a Dyson even on level 3 of the MI, but it's better than nothing ;)
https://www.youtube.com/watch?v=hIT3opq5lKg
Many thanks in advance.
Without specifically wanting to throw a Chinanoia into the room, especially since I don't trust Americans any further than I could throw them, but has anyone with electronic skills ever checked the part for microphones (or motion sensors misused for this purpose, as in the GeStaPo phones)?<--Cool no, a malicious CrApp usually doesn't need any authorisation to use them and nothing is displayed when they are tapped...No "Alu Hut fällig?", there are PoC's of them ;P) or even cameras? 0.o
Would such an inspection already void the warranty?
The answer that there is no danger if you don't give it the wifi passwords is no guarantee of security in my eyes, because it could have open wifi networks in the vicinity via which it could nevertheless exfiltrate all the data it has obtained from you, if it doesn't just filter the air! ;P
Really sad that because of such degenerate yuppies with the head in the --online-- cloud, where all these CrApp and therefore Wlan gimmick shit is so cool, you can't even buy a damn air filter anymore without having to ask yourself such questions... and of course having to rip apart all the devices first to scan them for barely visible or understandable potentially malicious technologies... So has any trustworthy person from the hacker community been through this with the part?
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