Multi-objective optimized design with strictly balanced impeller; smooth operation, low-noise, low vibration, and long service life - designed for purification and noise-reduction applications.Kitchen exhaust and oil fume extraction for canteens, hotels, and restaurants; auxiliary equipment for grain, chemical, and plastics machinery.Type A (direct drive) /Type C (belt drive).For air or non-flammable, non-toxic gases only; dust content <150 mg/m3, gas temperature <80 ℃C; long-term full-open operation not recommended; not suitable for dust exhaust.