What is Clean Air Delivery Rate (CADR)?
Clean Air Delivery Rate (CADR) is a measure of an air cleaner’s delivery of particle-free air. It is calculated from independent laboratory tests. To compare two room air purifiers look at the CADR numbers. CADR is measured across 3 particles; Smoke, Dust and Pollen, which due to their different sizes are filtered at different rates. The combined CADR is the rate for each of the particles added together to provide an accurate picture of the overall effectiveness of the purifier. The higher the CADR, the quicker the air cleaning. It is measured in cubic feet of particle-free air per minute. Because CADR is independently tested it is the most reliable way of comparing two room air purifiers.
