Laboratory Fume Hood Operating and Safety Guide
Laboratory fume hoods protect personnel from hazardous fumes, vapors, and particulates by containing and exhausting them away from the breathing zone. Proper use is essential for laboratory safety.
I. Safe Operating Procedures
- Pre-Use Check: Verify the hood is operating by checking the airflow indicator or alarm. The face velocity should be within the specified range, typically eighty to one hundred twenty feet per minute.
- Sash Position: Keep the sash at the lowest practical position during use. Never raise the sash above the maximum safe working height marked on the hood.
- Work Practices: Perform all work at least six inches inside the hood. Avoid rapid movements that can disrupt airflow. Keep the hood interior clean and uncluttered.
- Storage: Do not use the fume hood for chemical storage. Store chemicals in approved cabinets when not in active use.
II. What NOT to Do
- Do not place your head inside the hood while chemicals are present
- Do not block the baffles or airflow slots with equipment or containers
- Do not use the hood if the airflow alarm indicates insufficient flow
- Do not leave hazardous materials unattended in an operating hood
III. Maintenance and Certification
- Annual Certification: Fume hoods must be tested and certified annually for face velocity, containment, and alarm functionality by qualified personnel.
- Daily: Clean work surfaces after use. Check for visible damage to the sash or hood interior.
- Monthly: Clean or replace exhaust filters as applicable. Verify alarm and airflow indicator function.
- As Needed: Immediately report any change in airflow, unusual noise, or alarm conditions to facility maintenance.
