How much air should be delivered to the LOC when places are driven up 200' without a free airflow connection?

To determine the appropriate amount of air that should be delivered to the Level of Concentration (LOC) when places are driven up to 200 feet without a free airflow connection, it is essential to understand the requirements for ventilating underground mining practices.

The correct answer indicates that 12,000 CFM (cubic feet per minute) is necessary to ensure adequate ventilation for safe working conditions in the area specified. This amount of airflow is typically calculated based on factors such as the distance from the main air supply, the number of workers present, and the nature of the work being performed in that environment, especially in areas where air does not circulate freely.

In a mining or confined space situation, continuous airflow is crucial to dilute and disperse hazardous gases and maintain breathable air quality. If a place is driven without a free airflow connection—meaning there’s no direct passage for fresh air to flow—calculating the air requirement becomes even more critical.

The selection of 12,000 CFM reflects established industry standards to mitigate the risks associated with confined spaces, ensuring that air quality remains within safe levels. This level of airflow is sufficient to handle the increased demand for oxygen and to help manage any harmful gases produced from mining activities.

Understanding these ventilation