Xiaomi Smart Air Purifier 4 is a sleek, smart purifier for medium‑to‑large rooms (28–48 m²). It boasts a 400 m³/h CADR, removing 99.97% of particles ≥ 0.3 µm via a high-efficiency + activated-carbon filter combo, and generates 150 m³/h formaldehyde CADR
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