Clean Air Delivery Rate
(CADR) Calculator
What is CADR?
Clean Air Delivery Rate (CADR) indicates the volume of filtered air an air cleaner delivers. CADR is the product of efficiency and airflow. Effectiveness takes into account how much of the air you’re cleaning. An air cleaner that is 100% efficient at cleaning 300 cfm of air would have a CADR of 300. An air cleaner that is 90% efficient at cleaning 1,000 cfm of air would have a CADR of 900, and be 3-times as effective. CADR provides you with a metric for comparing various systems.
Use our CADR Calculator. Simply enter the airflow and efficiency of the air cleaner:
Clean Air Delivery Rate (CADR
Indicates the volume of “clean” air an air cleaner or air purifier delivers. CADR is the product of filter efficiency and airflow. Effectiveness takes into account how much of the air you’re cleaning. CADR provides you with a metric for comparing various systems. For example, Air Cleaner A is 100% efficient at cleaning 300 cfm of air, therefore it has a CADR of 300. Air Cleaner B is 90% efficient at cleaning 1,000 cfm, a CADR of 900, or 3x more effective than Air Cleaner A.
Filter CADR is Filter Efficiency x Airflow
Additive Air Cleaner CADR is based on effectiveness, time and test chamber volume. See ASHRAE Journal April 2022 Dr. Brent Stephens and Elliott T Gall, and Portland State University’s online calculator. Of note, additive air cleaners can also produce harmful byproducts and ultrafine particles as a result of uncontrolled chemical reactions.
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