Operators should check the hood area daily for visible blockage of airflow, e.g., large items or numerous containers blocking the lower slot opening in the rear of the hood. Airflow monitor devices should be observed before each use to check that the hood is functioning. If the hood does not have a monitor, secure a tissue paper strip at the opening to observe inward directional airflow; do not allow the paper to be drawn into the fume hood exhaust. Users should keep interior hood surfaces in a clean condition.
EHS checks fume hood airflow performance annually to confirm that:
- airflow into the hood is not compromised by cross drafts;
- airflow into the hood has a uniform inward pattern;
- average velocity of air moving into the hood is within acceptable range.
Guidelines and results are noted on the hood sticker placed on the front of the hood. If results are not acceptable a notice will be placed on the hood sash and repair request sent to the Facilities Management Work Control Center.
The sash sticker indicates the maximum sash opening for hood use (the opening used for EHS testing). In the event a hood lacks a hood or sash sticker or the test date is older than one year, contact EHS.
Facilities Management periodically inspects and maintains the hood system components such as lights, fans, and motors. Equipment failures or problems should be reported to the Work Control Center at 335-5071.