In a ventilation system, which operation would require the greatest capture velocity?

In a ventilation system, the operation that requires the greatest capture velocity is grinding. This is due to the nature of the dust and particulate matter generated during the grinding process. Grinding activities produce fine dust particles that can remain suspended in the air for longer periods, which makes it essential to capture them quickly and effectively to prevent inhalation and exposure risks.

The increased capture velocity serves to enhance the efficiency of the ventilation system by ensuring that the contaminants are drawn into the system before they can disperse into the surrounding environment. Using a higher capture velocity minimizes worker exposure to airborne contaminants and helps maintain an acceptable air quality in the work area.

While welding, sanding, and cutting also produce airborne particles and fumes, they typically generate less fine particulate matter compared to grinding, which is why they do not require as high a capture velocity. This distinction highlights the importance of assessing the specific requirements of different operations when designing ventilation systems to ensure worker safety and health.