Ventilation should occur wherever practical for manholes and other enclosures with openings into public areas. Which option best describes this requirement?

• A. Ventilation is optional
• B. Ventilation should occur wherever practical
• C. Ventilation is required only in new installations
• D. Ventilation should occur only during daytime hours

Answer: (B)

Ventilation in manholes and other enclosures that open to public areas is about keeping the air safe for anyone who might enter or pass by. The best choice expresses that ventilation should occur wherever practical, meaning you provide air exchange whenever it’s feasible to do so to dilute or remove hazardous gases, provide sufficient oxygen, and reduce heat build-up. This is a safety obligation that applies to all appropriate situations, not something you only do for new installations or only during the day. Hazards in confined spaces can appear at any time, so the option that emphasizes practical ventilation captures the real-world requirement: do it whenever you can feasibly implement it to protect workers and the public. Using natural or mechanical ventilation to keep the atmosphere within safe limits is the appropriate course of action.