What To Look For In An Air Purifier

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Recently, the rate of air pollution due to industrial activities has increased significantly. Also, our health has been threatened due to the presence of viruses like Covid-19, which stays suspended in the air for a reasonable length of time. To ensure cleaner air is breathed and to keep you and your household healthy, an air purifier may be necessary.

The question then is what do you look for in an air purifier when you decide to buy one? This article will give you an insight into what to look out for when buying one.

Things To Look For In Air Purifier

While buying an air purifier may be ideal, it is important to look for certain features when making a purchasing decision. Below are some of the things you need to look out for when buying an air purifier.


Air purifiers come in different sizes. The size of the room where the purifier is to be used will help you decide on the exact size of purifier to opt for. If using it in a small space like a baby’s nursery, then a smaller size might be better. Alternatively, if using it in a large sitting room, then it is obvious that a bigger size is better.

Type of Pollutant Filtered

There are different types of pollutants in the home. Some include pet hair and dander, smoke, dust, odor, etc. The air purifier you opt for should be able to filter out the specific pollutant you are concerned with. So, if you are concerned about cigarette smoke, go for a purifier that can effectively filter it out.

Alternatively, you can opt for an all-purpose purifier that gives you clean air generally.

CADR Rating

CADR means Clean Air Delivering Rate. It is a measure of delivery of purified air. It tells you how many cubic feet of air the purifier filters in a minute. The higher the CADR rating, the more quickly the purifier may be able to supply you with cleaner air.

To ensure you are getting the best, it is advised to go for a purifier with a CADR rating that is about 240 and above. The space to be purified should also be considered. If it is a large space, then go for a higher CADR purifier.

Air Change rate

The air change rate is the number of times the purifier cleans the air in the room per hour. When buying an air purifier, it is advisable to go for one with a good air change rate. An air purifier with an air change rate of 5 ACH is ideal.

Type Of Filter Used

Air purifiers are made with different types of filters. Filters used include a High-Efficiency Particulate Air (HEPA) filter, an activated carbon or charcoal filter, and an ionizer or ultraviolet filter. The recommended filter is a HEPA filter as it is the safest for use. While an activated carbon filter is also good, if over-saturated, it may result in the release of volatile compounds into the air.

Ionizers or UV filters are not particularly advised especially for those who have respiratory issues like asthma and bronchitis. There is also a HEPA-type filter which is not the same as a HEPA filter itself but offers relatively clean air.

Of all the listed filters, a HEPA filter is preferred as it offers the most in terms of purified healthy air.

Replacing air purifier dust and particle filter

How Much Noise Does The Purifier make?

Like most other machines, air purifiers also come with some level of noise. While some make loud noises, others may not be so loud. Depending on where you want to use the purifier, the noise level it produces should be considered. An air purifier that would be used in the bedroom or a baby’s nursery should not be too noisy to disturb sleep.

You also do not want a purifier in your living room that sounds like a generating set, so ensure you check the noise level ratings of any purifier before buying one.


When buying an air purifier, you need to decide if you want it to be moveable or stationary. If you are more likely to move the purifier from one place to another, then opt for a portable one that is light and easy to move.

You could also go a large purifier that has tires or rollers attached to it if you want a big one that is moveable.

Cost Of Maintenance

Purifiers also run some maintenance costs. If working on a budget, you need to go for a purifier that does not need regular maintenance. Most purifiers require filter changes regularly. To save you some cost on maintenance, you may want to opt for purifiers that require filter changes on a six-month basis.

This helps to save you some cost rather than buying one whose filters must be changed monthly.

Energy Efficiency Of Air Purifier

Electricity costs keep rising and air purifiers need electricity to run. To ensure that you are not spending more than necessary on electrical bills, you need an air purifier that can run efficiently, even on a low energy supply.
When buying your air purifier, to ensure that you get an energy-efficient one, check the energy rating and go for those rated as “Energy Star” as they require less energy to function optimally.

Additional Features

If money is not an issue, then additional features like filter changing indicator, remote control, dimming, display shut-off options, and a programmable timer, may be considered. Though these do not add to the effectiveness of the purifiers, they aid ease of use and comfort.


The use of air filters indoors has slowly become a necessity and knowing what to look for makes it easy for you to make a buying decision.

With the features discussed in this article, it should be easy for you to decide on the best air purifier that suits your needs, so go ahead and buy your air purifier now.

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