... , Ventilator, Ventilation, Ventilating Fan, Ventilation, Ventilator Fan, Ventilation, Air Mover Application: Air ventilating and exhausting in subway, tunnel, mineral, mountain, And ... fans of local ventilation are designed for ventilation of blind drifts at density of air up to 1.2 kg / ... standby one – and of a set of tools for reversing the air stream and transition from a running fan to a ...