A ventilation system in which the downcast air is conducted to the top end of the workings (in inclined workings) and it then flows downhill from level to level. In deep mines, the system helps to keep the faces cool.

What is ascensional ventilation?

A mine ventilation system in which the fresh intake air flows down to the bottom end of the workings and then ascends along the faces to the main return.

What is Antitropal ventilation?

Ventilation by a current of air traveling in the opposite direction to that of the flow of mineral out of the mine.