The Xiaomi Mi Air Purifier 4 Pro releases 8330L of clean air per minute and has a CADR of up to 500m³/h. The purified air is able to reach every corner of your home, so you can breathe healthy. The filter, made from large-area high-efficiency filter and large volume high-quality activated carbon, can last 6-12 months. The Xiaomi Smart Air Purifier 4 Pro features a 3-in-1 filter, including a primary filter, the Xiaomi’s high efficiency filter and a high-quality activated carbon filter, which work together to purify your air and keep you healthy.