What is CADR Rating & ACH on Air Purifiers?

What is CADR Rating & ACH on Air Purifiers? Air purifiers have almost become the basic need to survive in this world, full of air pollution. There is so much pollution in this world that we possibly cannot survive without air purifiers. Had there been no pollution and no dust particles, then we could survive without them, but now things have changed, and we need them now and then.

Every Hospital uses its purifiers to keep its patients safe from certain diseases. Imagine having no purifiers in a hospital. Even the patients who had chances of getting better could have suffered.

Air Purifiers not only help in getting rid of the dust present in the environment, but they also help in killing or destroying the microorganisms, viruses, and bacteria that can cause life-threatening diseases.

It won’t be wrong to say that air purifiers are lifesavers.

Many air purifiers have been invented so far that it has become challenging to find the best one. They are certain air purifiers that, instead of purifying the environment, end up polluting it. That is why there is a way to find the best purifier, which will make your life peaceful.

There has to be a standard, so it could have been possible to make the best air purifier. Back in time, it was not possible, but now it is entirely possible. Now there is a way through which we can measure the efficiency of an air purifier. Air purifiers rated by a term known as CADR rating based on their efficiency.

With the help of a CADR rating, you’ll be able to determine the kind of air purifier that is suitable for your place.

So if you are looking for the best way to check the efficiency of an air purifier, then you need to make sure that you check your purifier with CADR rating.

Two of our recent articles will help you understand the air purifiers in a better way, which are What is the True HEPA Filter and How it Clean the Air? and What is an Activated Carbon Filter for Air Purifier? available on a separate page.

How to measure the CADR rating?
CADR stands for a clean air delivery rate. This rating will save you from wasting your time by telling you instantly about an air purifier’s efficiency or effectiveness.

This rating determines the amount of pollution that a purifier can remove. It will tell you exactly how much pollutants will be removed with what kind of air purifier. Based on the size of your room, it will determine how fast an air purifier (HEPA, carbon, etc.) can clear it up and kill the harmful airborne particles or pollutants present in the atmosphere.

You need to know about CADR rating because it is only measured CFM or cubic feet per minute. Also, it is usually taken for the dust, smoke, or pollen. The inventors of this brilliant process to determine air purifiers’ effectiveness are the Association of Home Appliance Manufacturers.

That is why the rating of this organization is the standard one and the most accurate one. The higher the CADR rating, the higher the efficiency.

Furthermore, this rating can only determine the effing, which means an air purifier’s capacity to clean out the air. It cannot tell you about its capability. An ANSI/AHAM AC-1 test does the CADR rating.

The test is straightforward, to begin with. The testing agency put the air purifier in a chamber with a certain amount of pollution and contaminants. Later, they remove the air purifier from the chamber and measure the air once again. In this way, the CADR rating is determined.

CADR Calculation formula CADR = [(ACH x L x W x H) / 60] cfm

What is ACH?
The CADR rating is used to determine an air purifier’s cleaning capacity, while the ACH rating is used to determine the changes of air by the air purifier per hour. ACH stands for Air Changes per Hour.

The more the air changes, the better the air purifier. It will keep the room fresh for a long time. A better ACH rating is good for people who are vulnerable to allergies or have breathing problems.

Is ACH related to CADR rating?
ACH is related to CADR rating in such a way that to determine the quality and efficiency of an air purifier, both ratings are required.

What is a good CADR rating?
The CADR rating depends on the efficiency of the filter and the fan. The larger the surface area of the filters, the better the CADR rating will be. There is not any standard for a good CADR rating. The filters and the fans of the air purifiers help in determining their CADR ratings.

But the highest CADR ratings that have been determined until now are 450 CFM.

What is the normal range of CADR ratings in air purifiers?
The air purifiers have a CADR rating of 200 CFM or more than the better ones. Anything lower than this rating should be avoided. Other than this, the higher the CADR rating, the better the air purifier.

If you are looking for the best air purifier for your room, then you must get the one with the highest CADR rating.

Limitations of CADR rating
Although CADR ratings help you determine the efficiency of air purifiers, it also comes with certain limits. For example, CADR ratings can only be determined in pollen, dust, or smoke particles. When it comes to viruses and bacteria, it won’t work.

This means that this rating will not tell you that if your air purifier is capable of removing viruses and bacteria’s out of your environment or not.

This rating will only tell you what ratio of air pollutants will be removed, but it will not tell you if the purifier will remove the bacteria or viruses as well?

Also, it won’t be able to determine the effectiveness of air purifiers in the case of small particles. Also, the gases are not included when it comes to CADR rating.

For instance, if there is a presence of carbon monoxide in your space, then this rating will not be able to tell you if that gas will be removed or not.

Is it Necessary to Consider While Buying an Air Purifier?
Although CADR ratings have certain limitations yet they can facilitate people in a great manner. This rating will tell you a lot about purifiers. Air purifiers have become very popular, and almost every household, hospital, or other institution has these. They help a lot in keeping people from getting sick.

If people have better chances of getting better in hospitals, then it is because of these ratings. CADR ratings might not help fight everything about the air purifiers, but they surely help a lot.