What is the suggested air velocity produced by a hood for effective ventilation?

The recommended air velocity produced by a hood for effective ventilation is within the range of 24 to 36 meters per minute. This level of air velocity is critical for ensuring that contaminants are effectively captured at the source, minimizing the risk of exposure to hazardous materials.

Air velocities in this range provide a balance between sufficient capture efficiency and user comfort. If the airflow is too low, there may not be enough force to draw harmful substances away from the user and into the ventilated system. On the other hand, excessively high air velocities can cause turbulence that disrupts the airflow pattern, making it less effective in controlling exposure.

Ensuring that air velocity falls within this range is essential for the safety and health of individuals working in environments where toxic substances are present. This guideline helps maintain a safe workplace by enhancing the effectiveness of local exhaust ventilation systems.