Certified Safety Professional Practice Exam

The correct frequency for air changes in a storage room for flammable liquids is indeed six times per hour. This standard is in place to help ensure adequate ventilation, which is crucial in preventing the accumulation of vapors that could lead to fire or explosion hazards.

Proper ventilation minimizes the concentration of flammable vapors by diluting them with fresh air, thereby maintaining a safer environment and reducing the risk of ignition. This aligns with safety standards and regulations that outline acceptable practices for facilities that store combustible substances.

Other frequencies listed, such as four, eight, or twelve changes per hour, either fall below or exceed optimal guidelines, potentially leading to either insufficient protection or unnecessary energy expenditure without significant safety improvements. Thus, the choice of six times per hour strikes a balance between effective ventilation and practicality in managing the safety of storage areas for flammable liquids.