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How to choose an air purifier

#DelhiAirQuality is trending again on social media. Yes, it is a week after Diwali, and yet again the air quality in Delhi due to pollution has gone off the charts, literally. This seems like it is going to be an-every-year-occurrence. With air quality worsening on a daily basis, air purifiers are increasingly becoming a necessity. ET Wealth shares some crucial pointers to consider before you purchase one for your home.

Room size
This is the first thing you need to figure out when you set out looking for an air purifier. If you want a purifier for your bedroom or study, most entry level ones will work.

However, if you want a purifier for a larger room you will have to spend more and get either one large purifier or two small ones. Almost all purifiers give details on their effective area to help you decide.

CADR stands for Clean Air Deliver Rate and it is the international standard for calculating how effective an air purifier is. It is calculated as per a room’s area and helps identify how quickly the purifier will be able to clean the air in a particular room. In simpler terms, the higher the number of CADR of an air purifier, the faster it will clean the air.

Filtration system
Filtration system is the core element of a purifier. Most entry level air purifiers come with a three-layer filter system. It includes a pre-filter, a Hepa filter and a carbon filter which work to remove pollutants, dust particles and odour. Some purifiers combine these three into one filter unit, others offer three separate filters which can be individually replaced.

Pollution indicators
Most entry level air purifiers come with a basic LED indicator system for air quality—avoid these if possible. The newer models of purifiers come with a digital display that shows you the actual air quality level in your room. This makes it easy to fi gure out when you need to run the purifi er at maximum level and when you can turn it down.

Remote control
The majority of air purifiers do not come with a remote control. So every time you want to change modes or enable/disable a function, you will have to get up and do it yourself. This is why we recommend that you opt for a purifi er that comes with a remote. A few smart air purifiers connect to WiFi and you can enable/disable them via apps.

Filter replacements
Your air purifier relies solely on its filters to do the cleaning. So most fi lters would run out in a few months and would have to be replaced with new ones. This is a recurring cost. It would be best that you fi gure out the cost of replacement filters beforehand. This way you do not end up paying the price of new fi lter replacements frequently.

For your home: Mi Air Purifier 2S: Rs 8,999

This is the third generation of air purifiers launched by Xiaomi in India. One of the cheapest smart air purifi ers, it has a tower design with a fan on top—poor quality air is sucked in from the base, cleaned and released from the top. It has a digital display in front that shows the air quality, filter capacity, and humidity levels. It can be connected to WiFi and controlled with your phone using the Mi Home app. In our usage, the purifier was able to reduce an in-room air quality of 270 to 50 in under 30 minutes. It has a 3-layer circular filter which costs Rs 2,100.

For your car: Honeywell Move Pure 2: Rs 14,990

Honeywell is one of the few companies to offer car purifi ers in India and this is their second, upgraded version with a built in, real-time PM2.5 display. It uses dual fi ltration, HEPA + activated carbon. For your convenience, both of these are fused into a single fi lter that costs about Rs 1,500 to replace. Each fi lter can be replaced in under a minute and is rated to last for 360 hours. With two hours of use per day, you’ll need a new fi lter every 6 to 8 months. For the average size car, the Move Pure 2 can purify the air in about 20 minutes. You can verify this as you see the PM levels drop.
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