- Product Dimensions: 24 x 24 x 52 cm ; 4.8 Kg
- Item model number: AC-M2-AA
- ASIN: B01MSDYEQG
- Date first available at Amazon.in: 1 December 2002
- Average Customer Review: 140 customer reviews
- Amazon Bestsellers Rank: #4,388 in Home & Kitchen (See Top 100 in Home & Kitchen)
MI Air Purifier 2 (White)
- Air Purifier Type - Room; Purification method - High-Efficiency Particulate Arrestant (HEPA) filter type
- Coverage area: 400 sq. ft. / 37 sq. mtrs., suitable for bedroom / living room (medium)
- Clean Air Delivery Rate (CADR): 310 m3/hr; CADR indicates the volume of purified air (in cubic mtrs) which an air purifier produces every hour
- Warranty: 1 year on product
- HEPA triple layer filter, removes harmful PM2.5, Cleans air (400 square feet in 10 minutes)
- Real time AQI monitoring, MI home app smart controls
- Wattage: 4.8-31 watts
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Style: Air purifier
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From the manufacturer
Purify Room in Just 10 mins
MI Air Purifier 2 is simple, elegant and has a new compact design that is 40% smaller than the first MI Air Purifier. Despite this, it still offers a high 310m/h Clean Air Delivery Rate (CADR) and takes just 10 minutes to circulate purified air in a 21m room.
Covers All Angles
Your home is filled with invisible harmful substances. Get rid of these impurities with this air purifier. Equipped with a 360-degree triple layer cylindrical filter, composed of a PET primary filter, ultra-dense EPA filter and activated Carbon filter, this air purifier takes in air from all directions and filters out formaldehyde, bad odour, and other harmful substances.
Every Way the Wind Blows
This Mi air purifier 2, inspired by the aircraft engines, creates high air pressure and offers larger circulation which pumps clean air and distributes it to every corner of your home so you can inhale fresh pure air.
The Strong, Silent Motor
This air purifier operates without creating any noise so you can delve into deep sleep. Equipped with advanced aerodynamics and featuring a custom Japanese motor from Nidec, this Mi Air Purifier 2 is ultra-quiet and power efficient with seamless speed transitions.
Completely in Control
Download the Mi Home app and use your phone as a remote to switch this air purifier on and off. The app lets you monitor the air quality from your phone anytime and anywhere! It recommends you to close or open the windows depending on the air quality outdoors and sends you a reminder notification when the filter needs to be changed.
Instant and Precise Response to Air Quality Changes
This air purifier's sensor detects PM2.5 concentration in the air and allows real-time readings on your phone. This lets the purifier automatically choose the best setting for your room and takes about 8 minutes to circulate the air once in your master bedroom.
Top customer reviews
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Taking a star off my rating on these for the following 2 reasons:
1. There is no indicator by the purifier -- either on the device itself or via the app -- that the filter inside needs cleaning. Yesterday when I opened my air purifiers, all 4 of them had their filter drums covered by thick dirt. This is part of the SOP (standard operating procedure) of any purifier that the filters get dirty over time. But this purifier puts the onus on the customer to remember to clean the filter. My honeywell and philips give visual indications on their control panels that the filters need to be cleaned. Maybe MI will take care of this in the next iteration.
2. The air quality sensor goes out of whack sometimes and will start showing PM levels in 200s when another MI purifier in the same room will be showing the more accurate PM level of say in 60s. The cleaning of the sensor remedies the situation but for the sensor to start misbehaving out of the blue is unexpected and doesn't inspire confidence.
On the plus side, I do use the automation tab in the app to turn these purifiers on automatically during certain times of the day which is a nice feature!
Update ** 2nd Nov 2017**
These purifiers continue to perform impressively. At a time when Delhi and its surrounding areas are touching 300s and 400s AQIs (really sad to see this!), these workhorses are able to bring down the AQI inside my apartment to below 50. I bought 2 more of these when these went down to Rs 9000/pc. Adding to the tips below:
1. Every room, with the exception of your bathrooms and kitchen, in your house needs at least 1 of these, depending on the room size. Don't ever make the mistake of assuming that a single purifier, no matter how powerful, will ever cover more than 1 room -- be it living, dining, or bedroom -- no matter how big or small.
2. To extract the maximum effectiveness out of any purifier, make sure that your room is kept closed as much as possible when the purifier is ON. This is an absolute must to obtain Green-level AQI figures and more importantly to sustain these levels. The second the door of the room, or that of the apartment/house/kitchen, opens, AQI rises like crazy! The purified air is most quickly and efficiently obtained in closed rooms. If you have open living//dining areas where the purifiers are placed, make sure the bedroom/kitchen/main doors are kept closed! Of course, if the air outside is adequately good quality (which it currently is NOT), you should be ventilating the rooms to reduce the CO2 levels with the purifiers turned off.
Just received my 4th air purifier. Have 2 honeywell HAC35M1101G/W (costed me around 25K each) and a Philips 3256 (another 25K plus purifier, which I got for less than 19K on a great discount from amazon). Initial impressions -- this purifier costing less than half of the other purifiers gives them more than a decent run for their money!
1 This purifier has a CADR of over 300 (310 to be precise). More than the honeywell (CADR of 300) but less than that of Philips (CADR of 367). However, there is a discernible difference between the volume of clean air Mi throws out at max speed as compared to Philips and Honeywell. Mi Purifier 2 wins! Side-note: All the purifiers are super silent on Auto mode when the air is clean and in Night Mode.
2 Very easy to set up using the Mi Home app on iPhone (sorry, I don't own an Android phone!). Via the app on your phone, you can control the purifier remotely. This is a BIG PLUS! I can monitor air quality at home remotely (using the AirVisual node -- see below) and turn this purifier ON accordingly. This useful feature is lacking in Honeywell and Philips. This feature also comes in handy to use this purifier in my kids bedroom so that I can start it remotely because kids usually don't remember to start or shut down the purifier.
Via the app, you can control the following (besides seeing other stats):
- turning it on/off,
- switching the mode between auto/night/manual,
- and, the speed in manual mode
3. It also has a turbo mode which you can enable in the App settings. Only Philips, which is 3x as expensive, also offers turbo mode but this purifier's turbo mode completely blows away Philips' turbo mode. There is no comparison. Turbo mode essentially cleans the air faster, but it is loud! I use this mode sparingly.
4. The purifier throws the clean air vertically upwards the way the purifiers should so that there is no obstruction in the dispersion of the clean air. Philips and Honeywell throw the clean air upwards too, but at an angle because the way their vents are located. This is less than ideal because then the clean air hits the wall and bounces off of that.
-- the air quality reading isn't accurate. But then, no air purifier has accurate PM 2.5 reading. They tend to give the PM reading of the air which is in their immediate vicinity.
-- unit doesn't have a convenient handle to carry. But it is a light unit.
So, how does it perform?
I own an AirVisual node that I got from the US which gives extremely accurate reading of the air quality inside. When I put the node physically on the exhaust vents of the purifiers operating at full speeds, the lowest AQI reading I have seen are as below (anything below 50 is considered to be good):
-- the honeywell purifiers: 17
-- Philips: 4.
-- Mi Air Purifier 2 gets me a reading of 1. That's the lowest and best possible!!
The proof is in the pudding! If this air purifier continues to perform good, I may just consider selling the Honeywell purifiers and get more of these!!
PS: Folks have said that the filters would need to be replaced frequently on this purifier. Well, that *might* be true.
Air Filter Life, an update after 10 days:
The filter life at 100% is 145 days i.e. when you have bought unit brand new. I have now been operating the purifier daily for 10 days. The remaining life of the filter is however at 141 days and not 135 days. That's because I have used it for 90 hours (i.e. roughly 4 days) in the 10 days I have used it. Point being -- the filter will last you much longer than the 145 days because you only need to run the purifiers during certain times of the day -- before, during, and after cooking hours, an hour before ur bedtime (during night, it can be left on AUTO), or right AFTER you have u have opened the windows for ventilation (i.e. use the purifiers after you have closed the windows). Of course if you run it 24x7, it will last 145 days, but then you shouldn't be running these 24x7 (see tips below).
- ensure that you have the air purifiers running in manual mode or at least at a speed of 3 (Medium). Running air purifiers in AUTO is simply pointless! All it does is save you electricity. What it does NOT do is clean air as fast as it should because the sensors on purifiers aren't that smart. In auto mode, they will respond to AQI levels of the air near to the purifier, which are low because that air is clean anyways. I highly recommend running them at least at a speed of 3.
- ventilate your home/apartment early morning hours for 30-45 mins and maybe once in the evening to reduce the CO2 levels by opening your windows and turning on the ceiling fans. During these times the purifiers should be off. Ventilation would deteriorate the AQI level though. So turn on the purifiers right after the ventilation.
-- Turn OFF your purifiers when there is dusting/brooming/any sort of work that blows more dust than usual (carpentry etc) going on in the house. This will clog the filters faster. Turn the purifiers on AFTER the dust work has finished.
- please dump those "agarbattis" and air freshners if you have any. They would spike the AQI to over 200 in a jiffy!!
Added an extra pre-filter to the air purifier. The pics of the pre-filter and dust it trapped are attached. The purifier seems to function fine with the pre-filter, reaches levels as low as 10ug/m3. The maximum airflow does decrease and so does the noise levels. Any porous material like polyfill batting, non-woven tissue/cloth should work. Very thick or very dense material will cause more loss of maximum air delivery. Try at your own risk :)
Update: Nov 16 2017
All through the smog the purifiers worked well enough to keep the air quality levels at acceptable values (< 60ug/m3). At times had to run them at max to get the pollution down, but they did the task. Given this, I think they should work well in worst of the conditions. Goes without saying that you have to minimise air leaks and have enough of them depending on the size of the room. I have now ordered a 5th one.
Coming to the app, it works, however it is not the best of the apps. At places it still displays mandarin (Chinese). Also, the main screens don't update with the current AQI. You, have to step into each air purifier to check the values. At times the purifiers status shows offline even when the purifier is online. Overall the app is usable but experience is not the best.
Some people have said that it produces Ozone. No, this has no ions or ozone. Some people have said it is not HEPA, it is EPA. EPA (E11/H11) is a grape of HEPA. As far as I can tell even Honeywell uses the same grade.
Update: Nov 8 2017
During the ongoing smog, two in a 15 * 20 room are able to maintain levels around 50 ug/m3.
I have four of these now, the sensors only display consistent readings till 80 or 90 ug/m3. Thereafter all sensors display different readings in the room. I think it is fine, as this suppose to be an indoor air purifier and the levels above 100 ug/m3 are really not normal case. In last two nights, I have seen the sensors maxing out at 600 ug/m3.
Update: Nov 4 2017
I have three of these now. (For me, there wasn't a better choice at this price or even slightly more. The Philips AC2887 would be an option but it costs twice this).
There have been many more polluted days since the last review. The PM 2.5 concentrations have reached up to 150 ug/m3. Through this the air purifiers have worked to bring levels down to more acceptable levels. In larger rooms it takes two of them in silent mode (below half speed) to keep the levels on check on very bad days. On bad or average days, single one does the task. On very large spaces (18 feet high ceiling and open kitchen layout) it take 2 of these at full speed on very bad days.
- It works even on very bad days, you might have to run it at higher speed for sometime (and bear the sound) to bring the pollution down.
- Works to a degree at very large spaces. Although two or three do a better job.
- Is barely audible at 25% fan, 50% fan is quite audible, 100% fan is loud. There is also a extra turbo mode in app settings that unlocks even more speed. This level is really loud.
- Auto mode is configured towards silence. Best it to keep it around 25% or less in manual mode. This way it keeps cleaning well past the 40 ug/m3 levels and drops into 20 ug/m3 levels.
- Seems to be holding up to long working cycles. Almost 12 to 16 hrs of continuous running
- The sensors seem to be very consistent. All three read roughly the same values in the same room.
- The filter hasn't caught any dirt on the outside surface as yet. (Unlike the Phillips pictures I have seen on other reviews), Probably can use an extra per-filter in front of the cylindrical HEPA filter.
- The power cord is not very long, however it is detachable and uses a standard plug. A longer one can be bought to replace it.
- The pollution status light turns orange at 75ug/m3, which is a bit too high (This is in-line with Chinese official AQI standard). In my view it should turn orange at 45+ levels
Notes on readings in Mi App (in ug/m3) and converting to aqi:
By EPA (US standard - AQI)
0 to 12 - Good (0 to 50 AQI)
12 to 35 - Moderate(50 to 100 AQI)
35 to 55 - Unhealthy for Sensitive Groups(100 to 150 AQI)
55 to 150 - Unhealthy(150 to 200 AQI)
150 to 250 - Very Unhealthy(200 to 300 AQI)
250 + - Hazardous(300 to 500 AQI)
By Indian government standards (NAQI):
0 to 30 - Good(0 to 50)
30 to 60 - Satisfactory(50 to 100)
60 to 90 - Moderately polluted(100 to 200)
90 to 120 - Poor(200 to 300)
120 to 250 - Very Poor(300 to 400)
250+ - Severe(400 to 500)
To start with, it is a copy of Balmuda Air Engine (which is a more expensive product and is not available in India).
The most direct competition in this price point is Philips AC1215.
This cylindrical filter allows for very large filter surface area is a small volume. The Philips AC1215 filter exposed front area is 29 x 37.5 cm, the MI filter is 29 x 62 cm. Although Philips filter is slightly thicker, this doesn't completely make up for the smaller area. The Philips total filter paper area (including depth) is 1.6 m2 vs 2.1 m2 of MI. This is a significant difference is filter size.
Filter Edge Sealing:
Since there is a fan building high pressure to pull air through HEPA filter, the filter has to form a very good seal around the edges. With Phillips, the edges are much larger and most probably the per-filter leaks onto the HEPA and carbon filters. This also might reduce the efficiency (There is a review of Philips AC4025 on Amazon India with details around this problem). Mi has very little area to seal and filter is pushed in place with springs. There is also rubber/high density foam gasket to form a better seal. In my testing of airflow I could not detect any significant leakage at the seam.
MI has a compound filter - three filters are combined into one. This makes cleaning the per-filter very difficult as you risk damage to the HEPA/EPA filter. The Phillips is better at this, you can take out the per-filter and wash it or vacuum it.
The MI filter is overall cheaper than Phillips, but in Phillips you can change the HEPA independently of the carbon filter and that makes HEPA filter cheaper.
The filter seems to be well built. The HEPA/EPA filter is E11 grade (95% filtering at .3 microns). There are other purifiers with H13 grade (99% at .3micron). However, H13 filters require almost twice the pressure difference than E11 resulting in larger power consumption. Phillips doesn't specify the grade of the filter, it might also be E11 or can be H12 or H13.
MI claims filter life of 6 months, Phillips claims 12 months. Given the filter is bigger in MI, I am not sure how Phillips filter is going to last longer.
Filter Changing Ease:
The MI's filter is easy to change in comparison with Phillips. (Although this is not that important)
Air flow dispersion:
The MI's exhaust fan forms a vertical column vortex allowing for the clean air to be thrown much further away from the intakes. This leads to a better circulation. The Phillips AC1215 has no such design, the filter might be circulating clean air from it's very nearby surroundings leaving the other parts of the room with dirty air essentially compromising the efficiency of the air filter.
The auto mode is very silent however it has rough target of 40 ug/m3 after which it slows the fan down significantly. Essentially, in auto or night mode the air quality will be 30ug/m3 to 40ug/m3. If you want to target better ai quality than you will have to run it in manual mode. Also, after 3 hours of manual mode it shifts to auto mode automatically. Phillips also has a silent auto mode and it doesn't have any restrictions on how long the manual mode runs.
The Mi with it's efficient fan and filter design has lesser power consumption than Phillips. In auto & sleep mode, since it targets 40ug/m3 the power consumption is even lesser.
The maximum indoor pollution level I have tested at is 55 ug/m3. At this point in auto or night mode the fan can't be heard.
Pollution Sensor and other sensors:
I have two of MI air filters and another pollution meter. The sensor on MI is not completely accurate but is a reasonable approximation. Side by side both air filters track with an error of +/-5 ug/m3. I think the overall error is about +/-10 ug/m3. The sensor used is the Shinyei PPD42NS, which is reasonably good. However the display in the app doesn't do averaging over time and displays the current reading. This can have large variances and is not very accurate way to display. The integrated temperature and humidity sensor is very accurate. This is probably being used to correct the output of pollution sensor as with humidity the pollution sensors generally show a drift in accuracy. Phillips AC1215 on the other hand doesn't seem to report the actual pollution level.
Design and Size:
The design is good, the device is very small. This is due to the the cylindrical filter design. I think MI is much better than Phillips AC1215 in design and size.
The exterior is all plastic of decent quality. The intake grill has slight flex. The top fan grill seems very fragile (i would not want to test the flex on it). Overall it appears to be better built than Philips AC1215.
Customer care sucks.
As for ppm readings...to be taken with pinch of salt.but definitely in the ball park.
Must be working since filter is clogged with lots of muck....