Which method is commonly used for controlling mine ventilation?

The method used for controlling mine ventilation that stands out as most effective is the use of fans or air ducts. This approach is essential in mining operations to manage the airflow, ensuring that adequate fresh air is supplied to the miners and that harmful gases, dust, and heat are efficiently removed from the working environment.

Fans create a forced airflow that can push fresh air into different areas of the mine, while air ducts help distribute this air throughout the tunnels and chambers where miners are working. Effective ventilation systems are crucial not only for the safety of the miners but also for maintaining operational efficiency in coal mining.

Using air compressors, while beneficial in specific applications, does not provide the same level of airflow control needed for ventilation as fans and ducts do. Chemical sprays and vacuum systems serve different purposes and are typically not used for primary ventilation control. Overall, the combination of fans and air ducts provides a comprehensive solution to manage mine air quality and safety effectively.