Which statement best describes a clean room?

Which statement best describes a clean room?

• A. Lighting level defines cleanliness
• B. Humidity is irrelevant
• C. Temperature is the only factor controlled
• D. The concentration of airborne particles is controlled

Answer: (D)

Clean rooms are designed to keep very low levels of airborne particles, and their defining feature is the controlled concentration of particulates. This is achieved through specialized airflow, filtration (such as HEPA), meticulous cleaning, and strict gowning and procedures to prevent contamination. Lighting, while important for visibility, does not determine cleanliness. Humidity and temperature are important for process stability and comfort, and they are controlled, but they are not the sole measure of a clean room’s cleanliness. The key idea is that cleanliness is measured by keeping particle counts within specified limits.

Clean rooms are designed to keep very low levels of airborne particles, and their defining feature is the controlled concentration of particulates. This is achieved through specialized airflow, filtration (such as HEPA), meticulous cleaning, and strict gowning and procedures to prevent contamination. Lighting, while important for visibility, does not determine cleanliness. Humidity and temperature are important for process stability and comfort, and they are controlled, but they are not the sole measure of a clean room’s cleanliness. The key idea is that cleanliness is measured by keeping particle counts within specified limits.