CADR is a metric used to measure the efficiency of an air purifier or an HVAC system's filtration in removing specific pollutants like smoke, pollen, and dust. While mostly used for portable units, many of our Single-Zone units are designed to maximize CADR through "Multi-Stage Filtration." A higher CADR means the system can clean the air in a room more quickly, which is a major factor in "IAQ." Our Smart Single-Zone models are engineered to cycle air through the filters multiple times per hour. This is especially beneficial for people with pets or allergies. You can find replacement filters and Accessories to maintain your system's rated CADR performance. In Multi-Zone settings, each room can have its own customized level of air purity. It is an important part of our commitment to "Air Purification" and holistic comfort.