Clean Air Delivery Rate or CADR rating is the most significant factor when you choose an air purifier.
For different sized rooms and indoor air quality, you need to select your air purifier by the CADR rating. This advanced CADR calculator will help you to find out the minimum required CADR for your air purifier.
CADR Calculator for Air Purifier:
Formula: CADR = [(ACH x L x W x H) / 60] cfm, and
CADR = [(ACH x L x W x H) / 60) x 1.699] m3h
CADR Explanation
CADR or Clean Air Delivery Rate expresses the efficiency of an air purifier like horsepower for cars. It determines the air purifiers’ ability to filter the volumetric air within a specific time.
For example, A CADR of 200 cfm (cubic feet per minute) means it can filter 200 cubic feet of air in every minute on its highest fan speed settings. It also can be expressed as the cubic meter per hour (m3/h).
The term ‘Clean’ means the filtered air and not the purification level. The ability to trapping airborne pollutants depends on the filter types. Such as, a true HEPA filter can capture 0.3 microns airborne particles with 99.97% efficiency.
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Should I Care about CADR?
To understanding an air purifier, the CADR rating is the primary characteristic you need to look at it. To get effective air cleaning, you have to check on other aspects like filter types, filter surface area, efficient air intake and outlet design, and of course, you have to use it properly.
Please read our blog on how to use an air purifier to get the most out of it.
AHAM’s CADR
AHAM, Association of Home Appliance Manufacturers, tested and certifies air purifiers with three different CADR ratings: Tobacco Smoke, Dust, and Pollen. Tobacco smoke CADR represents the efficiency against fine particles, and the Pollen CADR means the efficiency against the larger particles comparatively.
To find out the required Tobacco Smoke CADR, divided your room area (sq ft) by 1.55. For example, if you have a 15 ft x 20 ft room (8 ft ceiling), then the area is 300 sq ft. So, the required Tobacco Smoke CADR is 300 / 1.55 = 194 cfm.
Here, you can find the list of AHAM-certified air purifiers with room size recommendation. However, AHAM verification is not a must-have thing when you are going to buy an air purifier. The certification will give you some extra validity.
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