A typical recommended face velocity for a fume hood is?

The recommended face velocity for a fume hood is typically around 0.5 meters per second. This velocity is essential for ensuring that harmful vapors and particles are effectively drawn into the hood and away from the user, providing a safe working environment.

At 0.5 meters per second, the airflow is sufficient to contain potentially hazardous substances within the fume hood, minimizing exposure to laboratory personnel. If the velocity is too low, there could be a risk of contaminants escaping; if it is too high, it could disturb the work process and create turbulence that allows materials to escape the hood.

The other options indicate either a much higher face velocity, which could be unsafe and impractical, or a significantly lower velocity that would not be effective in removing dangerous substances from the working area. Thus, 0.5 meters per second is the standard for achieving the balance needed for safety and functionality in fume hoods.