If you are thinking of buying an air purifier, you are doing the right thing. But getting an effective air purifier is even more important. There are some air purifiers in the market that are detrimental to health in the long run. So, you need to be extremely careful while choosing the right air purifier for your needs. In this air purifier buying guide, which is designed with Indian homes in mind, we will explain to you how exactly an air purifier works and what factors to look for while buying an effective air purifier.

Why Is It Necessary To Buy An Air Purifier In India?

Air Quality Map India

According to a recent report from the World Economic Forum, six out of the world’s ten most polluted cities are located in India. We all know how harmful air pollution is to humans, both in shot and long-run. Air pollution is linked to various health-related issues such as allergies, asthma, breathing problems, burning eyes, headache, throat irritation, and even lung cancer.

Indoor air pollution is the world’s largest single environmental health risk according to the World Bank.

And it is not just outdoor air pollution from industries and vehicles that you need to worry about. Even indoor pollution is extremely harmful. You might not know it, but indoor air pollution is the world’s largest single environmental health risk according to the World Bank. To save your family from air pollution and risks that are related to it, a quick and easy solution is to buy and install an air purifier.

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How Does An Air Purifier Work?

Air Purifier Internal Structure

An air purifier has two important things: filters and fans. With the help of fans, the air purifier takes the polluted air inside the room and passes it through the filters. During this process, particulate matter and harmful bacteria inside polluted air get trapped in the filter, and clean air is released back into the room. The higher the quality of the air filter, the cleaner the air gets. The higher the capacity of the fans inside the air purifier, the higher the amount of air it can filter.

Some air purifiers don’t have physical filters, and they solely rely on technologies such as ionization, electronic precipitation, and UV lamps. Such methods may not deliver you as clean air as what is possible via air purifiers that have physical filters. Some of them might even have negative health effects on your body. We will explain all of this further in the buying guide.

What To Look Out For While Buying An Air Purifier In India?

Apart from checking the quality of an air purifier’s basic components such as filters and fans, you also need to analyze the presence of additional features such as an air quality indicator (AQI), fan speed control, sleep mode, and smart home connectivity. Air purifiers from different brands also differ in terms of air filter quality, clean air delivery rate (CADR), coverage area, build quality, cost of filter replacement, warranty period, and service quality. Let us have a look at all those aspects below.

Your Air Purifier Should Have A HEPA Filter

There is nothing more important in an air purifier than the presence of a HEPA filter. HEPA stands for High-Efficiency Particulate Air filter, and it can remove 99.97% of particles that have a size of 0.3µm. It means that air purifiers with a HEPA filter can remove allergen, bacteria, dust, dirt, and some viruses from the air. HEPA filters come in different grades, ranging from H11 to H14. The higher the number, the higher the retention rate of pollutants. Most HEPA-based air purifiers for homes come with an H13-graded HEPA filter.

Air Purifier Filter Stages

However a HEPA filter can’t remove harmful gases and bad odour, and to remove those, an activated carbon filter is needed. An activated carbon filter can remove Benzene, Carbon Monoxide, Nitrogen Oxides (NOX), and Sulphur Oxides (SOX) from the air. Plus, a pre-filter can help in removing larger-sized air pollutants such as dander, human hair, pet hair, and building construction-related material. A UV lamp can neutralize bacteria and viruses. The best way to remove all the possible pollutants from the air is to choose an air purifier that has a combination of a pre-filter, a HEPA filter, a carbon activated filter, and a UV filter.

A good air purifier has a combination of a pre-filter, a HEPA filter, a carbon activated filter, and a UV filter.

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Why You Should Avoid Buying An Ozone-Based Air Purifiers & Air Ionizers

Ozone-based air purifiers use the ozone generator to release ozone gas into the air to neutralize bacteria and viruses. However, they are also harmful to human beings as ozone is harmful to the eyes and lungs.

An air ionizer charges air particles, and it makes bacteria and viruses stick to walls in your home. It means that those harmful microorganisms are not completely removed from your home. Hence, we advise you to stay away from air purifiers that use ozone or air ionization to clean the air.

What Is CADR (Clean Air Delivery Rate) In Air Purifiers?

While researching for air purifiers, you will see CADR mentioned in a lot of places. But most people don’t know what CADR stands for or what it signifies. CADR stands for Clean Air Delivery Rate, and it signifies what volume of clean air an air purifier can deliver at the highest fan speed. Higher CADR means that the air purifier can offer faster air purification.

CADR is measured in CMH (㎥/hour) or CFM (cubic feet per minute), and it can go from 100㎥/hour to as high as 500㎥/hour.

How To Calculate CADR Of Air Purifier?

To know the CADR required for your room, you should divide the square footage area of your room by 1.55. For a bedroom of up to 300 sq. ft., CADR of at least 193CFM is suggested, while a larger room such as a living room requires CADR of at least 250CFM.

CADR in CFM = Room Size in sq. ft. / 1.55

How To Convert Air Purifier’s CADR From CFM To CMH?

CADR in ㎥/hour = CADR in CFM / 0.588578

CADR in CFM = CADR in ㎥/hour x 0.588578

However, you should also know that CADR numbers are not always reliable. The CADR term was coined by AHAM (Association of Home Appliance Manufacturers), and it is a voluntary program, so the numbers can be a bit hit or miss. So, don’t always go by CADR numbers while choosing an air purifier.

Check The Air Purifier’s Coverage Area

Dyson Pure Cool Link Tower Air Purifier TP03

Some brands advertise the air purifier’s effective coverage area. For example, if an air purifier’s coverage area is mentioned to be 300 sq. ft., it can effectively clean air inside a 300 sq. ft. area. The higher the coverage area, the higher the air purifier’s effectiveness. However, air purifiers with a wide coverage area can be very costly. For most Indian homes, an air purifier with a coverage area of 200 sq. ft. to 400 sq. ft. is enough.

Air Purifier Coverage Area For Bedrooms: 200-250 sq. ft.

Air Purifier Coverage Area For Living Rooms: 300-400 sq. ft.

AQI & PM2.5 Indicator Makes It Easier To Understand Air Quality In The Room

Philips AC2887 Air Purifier

An AQI (Air Quality Indicator) on an air purifier lets you quickly know the air quality in the room, so it is important for an air purifier to have an AQI. A PM2.5 indicator displays PM2.5 levels in the room.

Most entry-level and mid-range air purifiers come with an AQI multi-colour LED to quickly check whether or not the room’s air is clean and safe. Higher-end models either have a numeric display or an LCD screen to display AQI and PM2.5 levels. Some air purifiers also display live AQI and PM2.5 numbers via a smartphone app.

Fan Speed Adjustment, Turbo Mode, & Sleep Mode

Philips AC3256 20 Air Purifier

An air purifier should also offer fan speed adjustment so that you can control how quickly it purifies air in the room or reduce its fan speed when you don’t need to run it at full blast. For example, when you are sleeping in your bedroom, you might get annoyed by the air purifier if it is running at its full fan speed. In such cases, you might turn on Sleep Mode, which automatically reduces the fan speed and thereby bringing down the fan noise below 20dB (which is considered quiet enough to not disturb sleep).

Some air purifiers automatically adjust fan speed as per the air quality in the room. They can also automatically switch between ‘Normal,’ ‘Turbo,’ and ‘Sleep’ modes, depending on the time of the day and air quality of the room.

Smart Air Purifier Features: Smartphone App, AI Voice Assistant Compatibility

Smart Air Purifier Smartphone App

Some mid-range and high-end air purifiers come with smart features such as smartphone app compatibility, internet connectivity via Wi-Fi, and compatibility with AI-powered digital voice assistants like Alexa, Google Assistant, and Siri. For example, the Xiaomi Mi Air Purifier 2S has a smartphone companion app for both Android and iOS smartphones, and compatibility with Alexa and Google Assistant. It can be controlled directly via Xiaomi’s new smart TVs that run the Android TV operating system.

Check If The Air Purifier Has A Filter Replacement Indicator

Similar to filters in water purifiers, filters in air purifiers wear out over time and need periodic replacement. Most people forget when they replaced their air purifier’s HEPA and activated carbon filter. So, all good air purifiers come with a filter replacement indicator. The indication to get the filters replaced is usually done via an LED, a buzzer, or a smartphone app notification. While buying an air purifier, double-check if it has a filter replacement indicator.

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How Cheap Is Replacing Its Filters & What Is Air Purifier’s Maintenance Cost?

Since the activated carbon filter usually needs to be replaced once in three months and the HEPA filter needs to be replaced once every year, the air purifier’s maintenance costs can quickly climb up on you. So, you need to check how costly it is to replace the filters of the air purifier that you are considering buying.

HEPA filters usually cost around ₹3,000, while activated carbon filters can cost anywhere between ₹1,000 and ₹3,000. So, you could end up spending more than ₹5,000 every year in maintenance costs for your air purifier. The higher the quality of the filters, the longer they can run without wearing down and offer a longer life. Hence, check the brand’s website or brochure to know how frequently you need to replace the air purifier’s filters and how costly it is to do so.

Longer Warranty & Faster Service Is Appreciated

Most air purifiers come with an easy-to-follow replacement guide and procedure so that every consumer can replace old filters with the new ones. However, in case something goes wrong, you would need help from the company’s professional technician to solve the problem. You can get certain things fixed for free if the air purifier is in a warranty period. So, choose a brand that offers longer warranty periods and has faster service in your area. Brands like Blue Star, Daikin, Dyson, Eureka Forbes, Philips, and Xiaomi are considered good in terms of air purifier quality.

Get Extended Warranty For Your Air Purifier And Breathe A Sigh Of Relief Along With Pure Air

Onsitego Air Purifier Extended Warranty Plan

If you don’t want to worry about the air purifier breaking down, you should consider extending its warranty period. Onsitego’s Extended Warranty Plan for air purifiers extends the manufacturer’s warranty by up to two years. It covers breakdowns and malfunctions. With our ‘No Questions Asked’ policy, you don’t have to answer anyone when anything goes wrong. It even comes with a free pick-up and drop service and a completely paperless process.

  • Extends Manufacturer Warranty By Up To 2 Years
  • Covers Breakdowns & Malfunctions
  • ‘No Questions Asked’ Repair Policy
  • Free Pick-up & Drop Facility
  • Completely Paperless Process

Once you look out for all these factors while buying an air purifier, you can easily shortlist and finalise a good quality air purifier for your needs and budget. If all of this is too much for you, and if you want to quickly know which air purifiers are the best in your budget, you can read our list of best air purifiers in India.

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