Which statement about ventilation in major repair garages is true?

Which statement about ventilation in major repair garages is true?

• A. Exhaust ventilation is required only when the building is occupied.
• B. Exhaust ventilation rate must be at least 0.3 m3/min/m2 at all times the building is occupied.
• C. Ventilation is not required in minor repair garages.
• D. Ventilation is provided only during summer months.

Answer: (B)

The main idea here is that garages performing major repairs must remove fumes and vapors at a controlled rate while people are working there. That means providing exhaust ventilation at a defined minimum flow, scaled to the size of the space, to keep air quality safe for occupants. The best statement specifies a concrete minimum: exhaust ventilation must be at least 0.3 cubic meters per minute per square meter of floor area, and this rate must be maintained at all times the building is occupied. This ties the requirement directly to both safety (removing hazardous fumes) and the actual size of the space, ensuring a consistent level of air dilution as activities generate pollutants. Context helps: vehicles, paints, solvents, and exhaust produce harmful gases and vapors. Keeping a steady exhaust rate during occupied hours prevents buildup and reduces exposure for workers. Why the other options aren’t correct: ventilation isn’t optional or season-dependent; it isn’t limited to minor repairs with no exposure risk. Requiring ventilation only during summer or only when the building is occupied omits the essential requirement to maintain a specified rate while people are inside, and the other statements fail to set a concrete, protective airflow standard.

The main idea here is that garages performing major repairs must remove fumes and vapors at a controlled rate while people are working there. That means providing exhaust ventilation at a defined minimum flow, scaled to the size of the space, to keep air quality safe for occupants.

The best statement specifies a concrete minimum: exhaust ventilation must be at least 0.3 cubic meters per minute per square meter of floor area, and this rate must be maintained at all times the building is occupied. This ties the requirement directly to both safety (removing hazardous fumes) and the actual size of the space, ensuring a consistent level of air dilution as activities generate pollutants.

Context helps: vehicles, paints, solvents, and exhaust produce harmful gases and vapors. Keeping a steady exhaust rate during occupied hours prevents buildup and reduces exposure for workers.

Why the other options aren’t correct: ventilation isn’t optional or season-dependent; it isn’t limited to minor repairs with no exposure risk. Requiring ventilation only during summer or only when the building is occupied omits the essential requirement to maintain a specified rate while people are inside, and the other statements fail to set a concrete, protective airflow standard.