How should man doors at fans be installed?

Installing man doors at fans in pairs to form an air lock is essential for maintaining proper air control and minimizing airflow disruptions within an underground mine. This setup helps to prevent the mixing of different air currents, which is crucial for ensuring that fresh air is directed effectively to the work areas while controlling the gases and contaminants that may be present.

The air lock created by the pair of doors provides a buffer zone that enhances the stability of the airflow. When one door is opened, the second door remains closed, which helps to preserve the pressure and flow of the ventilation system. This configuration also serves to limit the ingress of volatile gases and infiltrating moisture that could undermine the air quality and safety of the mining environment.

Additionally, having an air lock reduces the likelihood of creating pathways that could lead to hazardous situations, such as the influx of explosive gases or the depletion of breathable air. Therefore, the installation of man doors in pairs is a practice grounded in safety protocols and effective ventilation management essential to the underground mining operation.