AC4221 Smart Air Purifier For Home|Real Time AQI Display|Covers Upto 700 Sqft|Removes 99.97% Of Virus,Allergen,Dust & Pm2.5|50% Quieter|Filter Life Upto 9000 Hrs|Ideal For Living Room, Grey

This is a very good product.. value for money... Very silent in night, No disturbance Brings down the AQI to 5 in a closed room...

Have been using the product since the last 15 days. It works like a charm. Cleans the air perfectly well. During Diwali when the outside reading of PM 10 was above 1000 and PM 2.5 was around 700, the purifier took 15-20 minutes to turn the air quality of my closed bedroom (12x12 feet) from very dirty (red) to dirty (reddish violet). It took around 1.5 hours to turn to blue (safest level of the air sensor). However, 4/5 days post Diwali, when the pollution level had subsided, the air purifier cleaned the air (red to blue) within 15 minutes. The air quality sensor does a good job. The look and finish of the product is wonderful. Before using the product, do take the cover off the filters. But I have couple of problems with the device for which I have deducted 1 star: A) The night sense mode gets turned on as soon as you switch off the lights (even during daytime with curtains closed) and the auto mode cannot be used along with night sense. Thus, you have to either manually switch on the fan at a particular speed, which is counter intuitive or be ready for a switched off performance after the lights are switched off. B) The filters are not readily available. I even enquired at markets in Delhi and was informed that the set of filters would be available after a week as the company is unable to fulfill orders. Further, the set of filter costs about Rs. 4000. Even though I don't need one currently, the air purifier would have a recurring cost of Rs. 4000 every year.

Good product

It really works great. It's quiet at night, and it's super easy to open and clean.

I own other products from Philips and quite simply love them. But this Air Purifier, or should I say the Filters, are an EPIC FAIL. If, like me, you are buying this air purifier to remedy musty air/mold/mildew (which it indeed promises to do on the package and does for a while), only to turn into a harvesting ground for more fungal growth, you better avoid this air purifier. I wasted Rs. 9000 without a convincing remedy to my problem. You don't have to do the same. As is evident from my own experiences and some other reviewers, it is ABSOLUTELY NOT EFFECTIVE against mold, mildew, and any fungal growth. It might do well in a drier environment, but absolutely not in even a mildly humid environment. I bought this air purifier particularly to battle the musty air in my room; the outside air, too, is polluted here, but not as much as the bigger metros. At first, this air purifier delivered. A breath of nice fresh air... But, within 3 months, it reeked a horrible musty odour making it almost impossible to breathe, as the purifier was sitting right besides me in my study. After I couldn't take the difficulty in breathing anymore, I removed all the filters, and to my surprise, the Activated Carbon Filter had a nice thick green layer of fungal growth all over it. After smelling the purifier out some more (yeah, I did not have much of an option), I realized the actual fan inside the purifier too gave out the same stench, and it doesn't really has any facility to detach. I wiped the fungal growth with a wipe from the carbon filter. But, the carbon pellets inside the filter kept on stinking. So, I tried drying the carbon filter in the sun, but realized after a day that the carbon pellets/balls whatever you wanna call them, quickly evaporate in the sun. Later, I tried keeping the filter outside to catch the wind for a few days, but that didn't make much of a difference in the smell reeking through it either. I can't wash the filter, since it's been clearly specified on the filter not to do so. (I don't wish to damage the filter in one go.) So, basically, I have just one option - Change the filter (within 3 months).... And this part ticks me off - Combined, the 2 filters cost as much as the air purifier. So, if the 2 combined filters cost Rs.~4400, and the company is offering them to you for free with the air purifier the first time around, then the air purifier costs just Rs. 4500, because hey, nothing is really free! Well played Philips, you have a very profitable long-term money-making scheme right there. Well played.

A very good and almost silent air purifier. It works well for a 18ft x 12ft bed room effectively. It's super silent especially during nights. Brings down pm2.5 from 250 to 50 in less than a minutes time. Been using it close to a month. A good product so far.

Here is a try at a review of this product after using it for an year now. Use Case :- I am a NCR resident and the air pollution is as we know one of the worst possible if not the worst. I have it installed in the bedroom, about 300 sq ft so well within the advertised max room space. While using the purifier the room is kept closed to minimize pollution addition. Build Quality :- The purifier is sturdy in its built and aesthetically pleasing. It has a large front grill that acts as the air inlet, and an arched back that has a larger grill for filtered air outlet. The arc helps the air to be released vertically upwards and hence does not add to direct cooling for anyone sitting in front. This helps the filters use in winter which is the main season where it is required. The top of the filter has a dark panel with touch sensitive buttons and a decent sized circular LED screen. The 4 buttons are - Power, Night Mode, Fan Speed, and Child Lock. Setup :- The air purifier is shipped with its parts packed separately. Thus on unboxing the same has to be setup for use. The setup is pretty straightforward. The main filter units front can be released and the individual filters aligned in order on the central space. The installation order of the filter is as follows First -> HEPA Filter. (The same has indication on top to correct installation. You can also go with keeping the Phillips Branding on the top left Corner) Second -> Active Carbon Filter. (The same has indication on top to correct installation. You can also go with keeping the Phillips Branding on the top left Corner) Third -> Pre Filter. This one actually clips in place and is used to filter out the larger dust / impurities so that it does not clog the other main filters. Thus the filtering order is Pre Filter -> Carbon Filter -> HEPA filter Working :- The air purifier can be set to different modes. One of them being the automatic mode that automates the purifier working thanks to the inbuilt air quality sensor. The pollution level sensed regulates the fan speed accordingly. 4 levels are programmed and are indicated on the small circular LED screen by means of circular rings of different colors - Blue (Min), Violet, Pink, Red (Max). Red level would put the fan in maximum speed and blue would turn off the filter automatically. If you are not a fan of the automatic mode, you can use the fan speed button to move through the option of different fan speed/modes. They are Fan Speed 1 - Indicated by 1 on the screen Fan Speed 2 - Indicated by 2 on the screen Fan Speed 3 - Indicated by 3 on the Screen Automatic Mode - Indicated by A on the Screen Allergen Mode - This can be only added on top of Automatic Mode. It essentially bumps up the speed a bit on all the different color levels. This is to suit the sensitive people as this improves the air filtration rate. Turbo Mode - Indicated by T on the Screen. This puts the fan in the maximum speed possible Thats pretty much the major functioning of the air purifier. Additionally the filter has an automatic/forced night mode. The purifier automatically detects the lighting in the room and once it senses low to no light it automatically goes into night mode. The same can be forced by pressing the night mode button the purifier. What this does is that if the filter is in automatic mode, the fan speed is reduced on all the levels so as to minimize the noise. Summary :- So as to summarize my review and add my view here, the filter works pretty well for the use case i have. On regular winter pollution days its able to keep the air quality in control, even when working in automatic mode its able to go down from Red levels to Blue. Switching on an off intermittently as per the air quality levels. On drastic pollution days it has a tough time managing the air quality in automatic mode and i have to force it in turbo mode to get the air quality in control. If not too much of an air change is happening in the room throughout the filter is able to get the air quality to a much acceptable levels. The air quality indicator is a great value add on to the product. Much that is missing in similar priced competitors. I am little disappointed in the night mode working as it compensates air quality over noise. I believe the purifiers task is to ensure that the air quality in room is as good as possible. By reducing the fan speed to reduce noise works ok on normal pollution days, but is totally useless in any thing even a little worse (when i dont want to use turbo mode just yet) Durability of the filters has been decent. I have used it all through the winters last year and intermittently the summer this year but am yet to get an indication to change the HEPA or the Carbon Filter. On yes that reminds me the Air purifier would automatically sense and indicate when a filter needs to be replaced by displaying an error code on the screen. It even does that for the pre-filter which does not have to be replaced but just cleaned/washed. That i have received 3-4 times this past year. Overall i still strongly recommend this product- Good performance with a decent price which has been slashed a good amount from when it launched.

i take same model 1711, 1 from amazon and second same model from phillips showroom Cons: AI mode will not work as you want, if your room size even 10x10 (100 sqft) Pros very silent if set fan on 2, its quit and clean air properly . here in my area show aqi 150+ when start, and after 2 to 3 hours its show below 10, first 10 min it will reduce as much as approx below 40