Clean air delivery rate Or CADR
You may have heard the word CADR many times while purchasing the air purifier It is also called as Clean air delivery rate. In this blog let us find what is Clean air delivery rate and how it works in an air purifier and lets find out why it is important?
Clean Air Delivery Rate (CADR) is a metric used to measure the effectiveness of an air purifier. It indicates the volume of filtered air delivered by an air cleaner. The CADR is measured in cubic feet per minute (cfm) Or Cubic meter per hour (CMH).
A higher CADR rating means the air purifier can filter more air and do it faster. This rating is particularly important for those with allergies or asthma, as it shows how well the air purifier can remove airborne pollutants such as dust, pollen, and smoke from the environment.
However, it's important to note that CADR doesn't measure the effectiveness of an air purifier in removing specific types of pollutants, like volatile organic compounds (VOCs) or smaller particles. Therefore, while CADR is a useful metric, it should be considered alongside other factors when choosing an air purifier.
How to check air purifier CADR?
There are several Independent Govt. associations whom are testing the performance of Air purifier
Clean Air Delivery Rate (CADR) is a standard measurement that indicates the total volume of air that an air purifier can clean of a specific pollutant in one minute. It's usually measured for three common pollutants: tobacco smoke, dust, and pollen.
However, as a user, you typically don't measure CADR yourself. Instead, it's measured by the Association of Home Appliance Manufacturers (AHAM) in a controlled testing environment. The results are often listed on the air purifier's packaging or in its product specifications.
Here's a simplified explanation of how AHAM measures CADR:
- The air purifier is placed in a test chamber with a specific volume and the pollutant (smoke, dust, or pollen) is introduced.
- The air purifier runs for a set amount of time, and the reduction in pollutant levels is measured at the end of this period.
- The CADR is calculated based on the rate of pollutant reduction and the volume of the chamber.
Remember, when choosing an air purifier, a higher CADR rating indicates a greater ability to filter that specific pollutant from the air. However, CADR is just one factor to consider. You should also look at factors like the type of filters used, the size of the room the purifier can handle, and the specific types of pollutants it's designed to remove.
AHAM (Association of Home Appliance Manufacturers) Verified CADR (Clean Air Delivery Rate) is a certification that assures an air purifier's performance is tested and verified by an independent laboratory, following a standard method.
When an air purifier has an AHAM Verified CADR, it means the product's claims for tobacco smoke, dust, and pollen removal have been independently tested and the results are accurate. The CADR numbers will tell you the volume of filtered air delivered by the air purifier, with separate scores for tobacco smoke, dust, and pollen.
The higher the CADR number for each pollutant, the faster the unit filters the air. For instance, if an air purifier has a CADR of 200 for dust, it means it can reduce dust particle levels to the same level as would be achieved by adding 200 cubic feet of clean air per minute.
Remember to choose an air purifier that matches the room size where you plan to use it. AHAM provides a handy guide to help you choose the right size air purifier: just take the CADR number, multiply it by 1.5, and this will give you the approximate square footage the unit can handle.
