... fan Axial fan, Axial Flow Fan, Ventilator, Ventilation, Ventilating Fan, Ventilation, Anti-explosive mine ventilation fan Axial fan, Axial Flow Fan, Fan, Ventilator, Ventilation, Ventilating Fan, Ventilation, Ventilator Fan ... reverse of air stream without stopping the fan;· in case of emergency the unit is ... light and sound signals.· Mine fan unit in accordance with the safety rules consists of two fans ...