What happens to the quantity of air entering a split when a regulator is closed?

When a regulator is closed, the quantity of air entering a split decreases. Regulators are designed to control airflow in a mine's ventilation system. When the regulator is fully closed, it obstructs the passage of air, thereby limiting the amount that can enter that specific split. As a result, the airflow is restricted, which leads to a decrease in the quantity of air entering the area. This is significant in underground mining operations as proper ventilation is crucial for maintaining air quality and ensuring the safety of miners. If the air quantity were to remain the same, increase, or become unregulated, it would undermine the purpose of the regulator and could lead to hazardous conditions within the mine.