Xiaomi Mi Air Purifier 3: 380 m³/h CADR Triple-Stage Filtration Engineering for 484 Sq.Ft. Environments

The aerodynamic architecture of the Xiaomi Mi Air Purifier 3 is centered on a centrifugal fan assembly that drives a 380 m³/hr CADR through a 360-degree intake manifold. By leveraging a 3-stage filtration stack, the system achieves a 99.97% efficiency rating for particulates at the 0.3-micron threshold. The engineering physics of the 484 sq.ft. coverage area relies on the pressure differential created by the high-velocity fan, which overcomes the static resistance of the dense HEPA media. The manual speed control logic is a critical design feature, allowing users to bypass the automated PM2.5 sensor-driven adjustments to maintain a constant 380 m³/hr flow rate in high-load scenarios. The transition from a 32 dB noise floor to a 64 dB peak reflects the energy-intensive process required to move large volumes of air through a 3-stage barrier system. This filtration density is coupled with an activated carbon stage to ensure chemical adsorption alongside mechanical particle capture. Within its 484 sq.ft. specification, the unit manages air exchange cycles effectively, ensuring that the 99.97% filtration benchmark is consistently met despite varying particulate concentrations.