What is the maximum face velocity for pre-existing lab hoods?

The maximum face velocity for pre-existing lab hoods is specifically governed by safety standards that ensure effective ventilation while minimizing the risk of airborne contaminants leaking into the laboratory environment. The range of 120-150 feet per minute is recognized as optimal for maintaining proper airflow and fume extraction, ensuring that vapors and gases are directed efficiently away from the user and confined within the hood. This velocity helps in adequately diluting and removing harmful substances that may be released during experiments.

Selecting this range promotes safety and compliance with laboratory ventilation standards. A face velocity that is too low might not effectively remove hazardous fumes, while a velocity that is too high could lead to turbulence, potentially allowing contaminants to escape the hood. Knowing and adhering to this specified range is crucial for maintaining a safe laboratory environment.