General ventilation is described as which of the following?

General ventilation is described as which of the following?

• A. The removal of airborne contaminants close to their source of generation or release, before they can reach the worker's breathing zone.
• B. The control of temperature and humidity in the environment, and a properly designed system can act as a back-up control of exposure of any accidental emissions.
• C. A device that filters air after circulating through the room.
• D. PPE used to shield the face.

Answer: (B)

General ventilation aims to dilute contaminants and maintain a comfortable environment by circulating and exchanging room air. It works by bringing in outdoor air and exhausting indoor air, which lowers the overall concentration of any airborne substances and helps keep temperature and humidity in a safe range. When designed well, it can also act as a backup control for exposure if other measures aren’t sufficient, providing broad, room-wide protection rather than targeting a specific source. This description fits because general ventilation does not capture contaminants at their source (that would be local exhaust ventilation), nor is it about filtering air after it’s already circulating (that’s filtration or air cleaners), nor is it about PPE.

General ventilation aims to dilute contaminants and maintain a comfortable environment by circulating and exchanging room air. It works by bringing in outdoor air and exhausting indoor air, which lowers the overall concentration of any airborne substances and helps keep temperature and humidity in a safe range. When designed well, it can also act as a backup control for exposure if other measures aren’t sufficient, providing broad, room-wide protection rather than targeting a specific source.

This description fits because general ventilation does not capture contaminants at their source (that would be local exhaust ventilation), nor is it about filtering air after it’s already circulating (that’s filtration or air cleaners), nor is it about PPE.