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

The average face velocity for pre-existing lab hoods is generally recognized as 100 feet per minute. This measurement is critical for ensuring the effective capture of hazardous fumes and vapors, providing a safe working environment for laboratory personnel. A face velocity around this value balances the need for sufficient airflow to contain airborne contaminants while minimizing the disturbance caused by excessive airflow, which could adversely affect the processes occurring within the hood.

In laboratory settings, maintaining appropriate airflow is essential as too low of a velocity may allow contaminants to escape the hood, while too high of a velocity can make it difficult for users to work effectively and could lead to turbulence that disrupts containment. Adhering to the average of 100 feet per minute helps laboratories comply with safety regulations and best practices for fume hood operation.