The CF4-86 series features an impeller with a flat backward-blade design, offering high efficiency and strong static pressure. This configuration effectively reduces oil buildup on the blades while delivering excellent aerodynamic performance. This series is widely used for kitchen exhaust, fume extraction, or ventilation in institutional canteens, hotels, restaurants, and other public kitchens. The transmission medium is air or other non-self-igniting gases that are harmless to the human body. The medium must contain no viscous substances, operate at temperatures ≤80°C, and have dust and hard particulate matter not exceeding 150 mg/m³.