Clean-air Delivery Rate
Clean Air Delivery Rate (CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed. For air filters that have air flowing through them, it is the fraction of particles (of a particular size distribution) that have been removed times the CFM air flow rate through the device. More precisely, it is the CFM of air in a 1008 cubic foot room that has had all the particles of a given size distribution removed, over and above the rate at which the particles are naturally falling out of the air. Different filters have different abilities to remove different particle distributions, so three CADR's for a given device are typically measured: smoke, pollen, and dust. By combining the amount of airflow and particle removal efficiency, consumers are less likely to be misled by a high efficiency filter that is filtering a small amount of air, or by a high volume of air that is not being filtered very well.
Read more about Clean-air Delivery Rate: Applicability, Understanding The Rating, History
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—Charles Dickens (1812–1870)
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—A.E. (Alfred Edward)