At what intervals should man doors be installed between intake and return airways for coal heights over 48 inches?

Man doors are critical for ensuring safe access for miners and emergency responders in underground coal mines. When it comes to the installation of man doors in relation to airways, the spacing becomes crucial for effective ventilation and safety practices.

For coal heights exceeding 48 inches, the requirement for man doors to be positioned at specific intervals is based on best practices in mine ventilation management. Installing man doors at 600-foot intervals between intake and return airways strikes a balance between accessibility and maintaining effective airflow through the mine. This spacing allows miners to move safely from one airway to another while ensuring that the air quality can be monitored and adjusted as needed.

In this context, having man doors every 600 feet allows for sufficient access while also preventing excessive openings that might disrupt airflow or ventilation efficiency in the mining area. Proper spacing ensures that the doors can be maintained and monitored effectively, thus enhancing safety for all personnel working in the mine.