Today we tell you about CADR, a feature that will have implications on how your new air purifier works. “Clean air delivery rate” is a term that you will invariably come across when shopping for an air purifier.
So, let’s begin at the beginning.
What is CADR?
In early 1980s, the need for an objective test method for measuring the performance of home air purifiers was felt. Hence, the ANSI/AHAM AC-1-2006 standard was created. Clean Air Delivery Rate (CADR) was established as a performance metric for the newly created standard.
Clean Air Delivery Rate indicates an air filter’s effectiveness in reducing smoke, dust and pollen particles. The comparison is done for particles between the range of 0.10 and 11 micron. For comparison’s sake, the diameter of a human hair is around 100 microns.
How is CADR measured?
Clean Air Delivery Rate is measured in terms of volume, hence the numbers you see are mentioned in cubic feet. The higher the CADR value, the faster an air purifier will filter ambient air inside a room.
Why is CADR important?
CADR has become the industry standard for measuring the effectiveness of an air purifier. It is widely adopted by air purifier makers. CADR measurement provides an instant comparison between the abilities of two or more similarly priced home air purifiers. Thus, helping you – as a buyer – in making an informed choice.
Other Features You Should Know Before Buying an Air Purifier for Home
Number of Filters:
Ideally, a high-quality air purifier will have 3 air filters – a pre-filter, a HEPA filter and an activated carbon filter. The pre-filter acts as a buffer for the two main air filters. It removes large dust and debris from the incoming air so that the air that goes on to the main filters is cleaner. The pre-filter helps in extending the life of the main filters and is washable and reusable.
The High-Efficiency Particulate Air filter is the main component of a home air purifier. It removes up to 99.9% of the particulate matter (also known as PM) from the ambient air.
Finally, the activated carbon filter removes gaseous elements and volatile organic compounds such as formaldehyde fumes from the ambient air. It also removes odours by capturing the odour inducing particles.
Quality of Filters
Even an air purifier that has all three filters may not perform up to the mark if the manufacturer is not using the highest quality air filters. We use international grade HEPA filters and have patented filter technology such as HiSivTM.
The coverage area is related to CADR. It is the total area which an air purifier can effectively clean with the certified CADR. A room of 1,008 cubic feet is used in ANSI/AHAM AC-1-2006 as a standard measuring size for determining CADR. But it’s application will differ from product to product. Our air purifier for small to medium rooms with the CADR of 250 cubic meters per hour can clean an area of 323 square feet within 15 minutes.