How to buy Your Next Air Purifier in 2020

7 Key Points to Consider While Buying Air Purifier

  • Air Purifiers are becoming mainstream household appliance today in 2020.
  • Air Purifiers are more relevant in 2020 than ever before.
  • Air Purifiers procurement needs different knowledge of understanding to the consumers.


n Delhi, the haze and smog are already full on. Everyday you can see haze in the air. Even you can feel the difference in the air density every year this time. The Air Quality Index is already in full alert mode. But what can we do in this situation ? Noting much. We cannot do much except to stay in indoors, wear masks in outdoors, and drink lots of fluids to dissolve the pollution. But staying always inside the room is also not good solution. Because the rooms are also affected with pollution. The rooms Air quality index is almost similar or sometimes more than that the outside also. In this post we shall give 7 points to consider while buying Air purifier.

The alternative way to cope in this situation is to get an air purifier for the home. But buying air purifiers are relatively new in the India. The companies are putting many different features in the different ways to sale their products. That can be really confusing to decide which product to buy. In this post we are not going to mention any brand specific features but we are going to give you information about the points which can help you to decide the next air purifier you are planning to buy.

If you haven’t already bought one, here’s what you need to look out for. First of all, every air purifiers are functioning same way. The core functionality is same for the all purifier that is clean the air inside the room. But don’t think that buying and putting an air purifier will solve your every problem. The Air purifier works with basic engineering and scientific principles. Every air purifier has some or other limitations. In this post we are going to talk about top 7 points to look for while making buying decision of an air purifier.

Air Purifier’s HEPA Filter

HEPA is basically an acronym for High Efficiency Particulate Air. So when we talk about HEPA filter, that is basically a High Efficiency Particulate Air filter. Just like any other filters, the HEPA also comes with many possibilities and demerits.

A commercially designed HEPA filter is going to basically function to filter the air from the dust particles. The HEPA filter you are planning to buy, you must see the testing and certifications in this HEPA filter. Then only you can know exactly what to expect from the filter and air purifier. The Institute of Environmental Sciences and Technology narrates that a true HEPA filter must be able to trap 99.97% of particulates of 0.3 microns or larger in your room. New HEPA filter may also have functionality of removing more smaller particles. During the testing process of the so many years this threshold has come up. So you understand that this is the very bottom line of the air purifier.


Air Purifier’s CADR (Clean Air Delivery Rate)

This is second important parameter you must understand. This is called CADR which is acronym for Clean Air Delivery Rate. This has became an international standard for understanding the Air purifier performance and effectiveness.

During the development of the Air purifier this goes into very rigorous tests. They are taken through dust, second-hand smoke and pollen to calculate the rate of clean air delivery per unit of time. The higher the CADR, the more effective the purifier.

So basically while looking for air purifier you must look for how quickly the air purifier functions. How many cubic feet of air the purifier can filter in one minute. Higher the CADR number, better the air filtration. Air purifiers consist of three CADR numbers for dust, pollen and smoke.

Clean Air Delivery Area - leanshelf

Recommended Effective Area

The third point which you really need to understand and for some users this is most important point also. The biggest confusion we found during conducting market research about the Air Purifier among people. Can the Air purifier clean my drawing room or is it able to do in the bed room only. Can be the performance same in my 12×12 room or can i use it small room where i study?
The main point to clarify this point is known as Effective Area of the Air Purifier. The effective area of the air purifier is basically based on the CADR and also affected by the room height and plot ratio.

For example, many air purifier follows the GB/T 18801 Air Purifier standard to build up the effective area. The Effective area can be CADR x (0.07-0.12)

Clean Air Area

No ozone

There are some brands of Air Purifiers who have designed the Ozone to purify the air. We don’t recommend those air purifiers. Ozone sometimes irritates the lungs and can cause chest pains, coughing, and shortness of breath, even in people who don’t suffer from asthma and lung problems. This is found that Children and older adults are more sensitive to ozone.

The Environmental Protection Agency of USA stated that

“At concentrations that do not exceed public health standards, ozone has little effect in removing most indoor air contaminants.”

The ozone in even very low levels also can be harmful for health. The daily exposure can permanently damage your lung tissue. As the awareness going many air purifiers company no longer uses ozone as purification agent. But there are still we see some air purifiers which use ion generators to purify the air. Sometimes they can emit low levels of ozone in the air.

no ozone air purifier

Listen for the noise of the fan

The mechanical model if the main key standard for air purifiers. Every air purifiers use a fan to force air through the HEPA filter. And during this process this also traps particulars while letting the air flow back out. There are other kinds of air purifiers, but mechanical filtration is proven and cost-effective.

Though this design is simple but the main drawback is the noise. But imagine if you’re planning to use the air purifier in your bedroom while sleeping. You won’t even imagine that one that sounds like a vacuum cleaner or generator.

So how do you understand that how loud an air purifier is? You can listen to it in the store, the noise is mostly relative – what sounds quiet in a crowded mall can sound loud in a quiet bedroom. For a more objective test and understanding you can checkout the rated noise levels in decibels (dB or dBA). This two may be different but for easy understanding we keep them in same standard.

Buy brands that will stick around

Buying Air purifier is to be like buying Air conditioners. Means you should expect it to run for some years. Because this is not like electronics device eg mobile phone which we use every moment. This is basically mechanical device while we can change the filter regularly and keep the system running like Air conditioners. So always prefer some brand who are going to stick around and will provide you the parts like filters or fans if required.


So what is the conclusion? To keep the things simple, we have kept the list short and simple. We have only mentioned the absolute key points which you need to keep in mind to decide the Air purifier for you.
To buy an air purifier to deal with the haze in mega cities you must keep the things in note. if we sum up , you must check out the below points while buying a air purifier :

  • Have a true HEPA filter
  • Be the right size for the room
  • Produce zero ozone
  • Use a fan that’s quiet enough for the room
  • Be around for the long-term

Other filters are nice-to-haves in comparison. For example, carbon air filters can absorb smoke, odors, chemicals and gas, while ultraviolet light filters can kill bacteria. If you don’t need these features and just want to deal with the harmful PM2.5 particles in the haze, you can skip them.