An AHU is the central equipment in centralized HVAC systems responsible for filtering, heating, cooling, humidifying, dehumidifying, and delivering air. Through a sophisticated control system, it mixes outdoor fresh air with indoor return air in precise proportions, processes it through multiple stages, and then distributes it indoors. This ensures optimal indoor temperature, humidity, cleanliness, and airflow velocity. Whether in large shopping malls, office buildings, hospitals, hotels, or data centers and pharmaceutical factories with stringent environmental requirements, AHUs are essential for maintaining indoor air quality and comfort.