Which cabinet provides a cage environment with linear-flowing filtered sterile air?

• A. Laminar flow cabinet
• B. Class III biosafety cabinet
• C. Fume hood
• D. Cage changing station

Answer: (A)

Unidirectional, HEPA-filtered airflow is the hallmark of a laminar flow cabinet. It delivers air in a single, straight direction across the work surface, creating a sterile barrier around the cage area and minimizing contamination during cage changes or other sterile manipulations. This linear flow keeps particulates and microbes from drifting into the work zone, which is essential for maintaining a clean cage environment. A Class III biosafety cabinet is designed for containment of hazardous agents and isn’t used to provide sterile air for routine cage handling. A fume hood focuses on removing vapors and fumes, not on creating a sterile, protected air curtain for cages. A cage changing station by itself lacks a built-in sterile air supply, so it doesn’t provide the same controlled environment.