Which ventilation configuration is required for spaces containing gasoline, machinery or fuel tanks?

• A. Natural supply and mechanical
• B. Forced ventilation
• C. Natural only
• D. Mechanical only

Answer: (A)

Gasoline, machinery, or fuel tanks can emit flammable vapors, so the space must be ventilated to dilute and remove those fumes continuously. The best setup brings in outside air (natural supply) to provide fresh air from the exterior, while an exhaust system (mechanical) actively removes vapors from the space. This combination helps keep vapor concentrations below flammable levels and prevents buildup, which is crucial since gasoline vapors can accumulate near the floor and spread through the space. Relying on natural ventilation alone may not move air efficiently to remove fumes, and relying on mechanical ventilation without a outside-air supply can fail to bring in fresh air or adequately dilute contaminants.