Which engineering control is certified every 6 months?

The engineering control that is certified every 6 months is the hood, specifically indicating a biological safety cabinet or fume hood used in laboratories. Regular certification of hoods is critical to ensure that they are functioning correctly and providing the necessary protection for personnel working with hazardous materials. This certification process involves verifying airflow patterns, measuring containment capabilities, and checking for any mechanical issues. Such frequent evaluations help maintain safety standards and compliance with health regulations in environments where biological or chemical hazards are present.

While other devices like autoclaves, laminar flow workspaces, and refrigerators may have their own maintenance and testing protocols, they do not typically require certification as frequently as hoods do. This highlights the importance of hoods in maintaining a safe laboratory environment, thereby justifying their rigorous and regular certification schedule.