Our Duct fans is ideal for venting smoke outside Duct fans of wind pressure (945 Pa) can be more efficient air convection. High system airflow rate of 249m³/h can efficiently exhaust smoke. Includes a variable speed controller, which can adjust the air volume in ten steps A 1.5m hose is provided to suit your workplace. Duct Size: 4" | Air Flow: 146 CFM | Noise: 48 DB | Air Pressure: 945 Pa | Speed: 7500 (RPM) | Power: 32W | Size: 6.5 x 5.7 x 5.7 In
