How many types of ventilation ducts are there?

1. Duct-type ventilation: the equipment is simple, flexible and convenient, and easy to disassemble, but due to the small section, the ventilation resistance will increase with the lengthening of the pipeline. Ventilation duct installation 2, tunnel ventilation: it is suitable for long tunnels with parallel guide pits, characterized by the fact that the front tunnel and the parallel guide pits form a circulating air flow system through the front cross channel, and the ventilation ducts are installed near the flat guide pit for ventilation. machine, the dirty air is drawn out from the flat guide, and the fresh air flows in from the positive hole to form a circulating air flow. 3. Wind wall ventilation: use part of the tunnel into a hole to separate an air duct with bricks or wooden boards to replace the large-diameter air duct, so as to shorten the length of the air duct and increase the air supply to meet the ventilation requirements. The air duct processing type is suitable for the situation where the shortening is long and there is no parallel guide pit available, and the duct ventilation is difficult to solve comprehensively.

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