Ventilation noise often travels further than expected because it is carried through ducts, openings, shafts, roofs and lightweight building surfaces. In industrial and commercial facilities, the issue may come from high air velocity, fan blade noise, turbulence, vibration, poor duct design or insufficient acoustic treatment around openings. Buyers usually start looking for a solution when noise affects workers, nearby occupants, customers, neighbours or project approvals. A good industrial ventilation noise control plan reduces unwanted sound without compromising airflow, access or serviceability.