How To Choose The Right Size Air Purifier 

Have you decided to buy an air purifier for your house? Are you confused about which size will be appropriate for the room?

Before you decide on buying an air purifier, it is very important that you have a proper idea of your room’s size. If the air purifier you have bought does not cover the whole room, then it becomes useless. The worst-case scenario will be you thinking you are inhaling purified air, where actually it is quite the opposite.

In this article, we will discuss how you can determine the size of an air purifier that will cover the whole room. After reading this article, we are quite sure that you will confidently walk away having the proper knowledge on the proper size for an air purifier.

What is CADR?

CADR or clean air delivery rate is the standard measurement. This measurement was developed by AHAM. This rating provides customers with the ability to compare the performance of different air purifiers. This rating is also given importance by the Environmental Protection Agency of USA (EPA). Also, the American Lung Association has recognized these ratings.

In the CADR rating, it specifies the volume of air purified by the air purifier in CFM (cubic feet per minute). CFM is the standard unit for measurement for CADR ratings. The higher the ratings, it specifies that the purifier is faster as well as more efficient. The more the efficient the purifiers, the better is the fan used by the purifier to filter the air. So, better CADR rating means more purified air.

How is CADR Measured?

The tests for the rating are conducted by AHAM or Association of Home Appliance Manufacturers. The test is performed to measure noise levels as well as filtration performances. In the case of filtration, the test is conducted for three particles: pollens, smoke, and dust.

The test is conducted in a separate room where the purifiers are turned on for 20 minutes. Measurements for the quality of air are taken before as well as after the test. Based on the results, the rating is given to the purifier. You will often come across the CADR rating in the manual or the box of the purifier.

How to Choose the Right Size for an Air Purifier?

You have understood the importance of knowing your room size before buying an air purifier. But, you don’t know based on the room’s size how you will decide the size of the purifier. In this section, we will discuss that.

There are three steps that you need to follow that will allow you to choose the right size of an air purifier.

1. Determine the place you want to keep the air purifier

The first and foremost factor while determining the size of an air purifier is to know where you want to keep them. DO you want to purify the air of a single room, many rooms, or the whole house? Once you get the answer to that question, you can narrow down the options. Narrowing down your options will make it a lot easier to compare among the different products.

2. Measure the space

Once you have determined the purpose for an air purifier, your next step is to determine how much area. For that, you need to calculate the square footage or the space you want to purify the air.

The measurement procedure is very easy for a single room. You just need to take a measuring tape for that. You need to measure the dimensions of the two vertical walls using the tape. This gives you the square footage of the specific room.

For example a 12’ X 12’ room = 144 sq ft.

If you want your air purifier to purify the air of several rooms, then you have to repeat the above process for each room. After finding out the square footage of each room you have to add them. The sum is the total square footage of the several rooms.

But this process becomes quite difficult when you are looking for an air purifier for the whole house. For that, it is best if you bring out the paperworks that you got while buying the house. The paperworks have the square footage written on them.

3. Match the ratings

While you go to buy an air purifier, you will notice that they are available in different shapes as well as sizes. In the specification list of each air purifier, you will notice a square footage rating. Compare the rating along with your desired square footage. To get best results from your air purifier, it is best to buy an air purifier that comes with a larger square footage capacity than your desired space

How to Measure Required CADR Based on your Room?

According to the ⅔ rule proposed by AHAM, the CADR for your room should be two-third times the size of the room in square feet. Basically, if you wish to cover 200 square feet then you need a CADR of minimum 133 CFM. it is always better to have higher CADR.

How to measure a room size based on CADR?

According to the guidelines set by AHAM, you need to multiply the given CADR with 1.55. This means that an air purifier having CADR 400 CFM can cover a room having 620 square feet. This is the only formula according to the requirements of CADR that will remove 80% of the particles.

But this is not so simple. This is the assumption for ideal scenarios. For ideal situations, the consistent output of one air exchange in one hour. Oransi suggests you should also take into consideration the height of the ceiling as well. So, along with length and width, you need to consider the ceiling height as well.

Frequently Asked Questions

1. Can you use multiple air purifiers in a single room

It is not always required to put multiple air purifiers in a single room. But if the power of the air purifier is low, then you can use more than one air purifier for a single room. For multiple air purifiers, you need to keep the air purifiers in different places so that the whole room gets covered. For multiple air purifiers, you need to make sure that all the air purifiers are of the same power.

2. Will a Small Air Purifier Work In a Large Room?

Usually, the answer is no. But some small air purifiers may work well in a large room if the power of the fan is strong. Also, it depends on how many small air purifiers you have put inside the large room.

Final Word

After reading this article, we hope that all your doubts regarding what is the perfect size for an air purifier for your room. If you still have any doubt regarding the matter, feel free to post your questions. We will be more than happy to help you clear your doubts.

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