What is included in common ventilation plans?

Common ventilation plans typically include both supply and exhaust ventilation to ensure adequate airflow and maintain a safe atmosphere in confined spaces. Supply ventilation brings fresh air into the space, while exhaust ventilation removes stagnant or contaminated air. This dual approach is essential for effective ventilation, as it helps to control the levels of harmful gases, vapors, or dust that can accumulate in confined areas.

While "supply ventilation" and "exhaust ventilation" are both critical components, they work best in tandem to create a balanced ventilation system. Planning for ventilation in confined spaces encompasses strategies that utilize both systems effectively to protect workers' health and safety. Thus, option "C" reflects the comprehensive nature of common ventilation plans by recognizing the necessity of implementing both types of ventilation for optimal air quality management.