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Although the first research in the field was carried out by Davy in 1816, the first discovery emerged in 1891 when Le Chatellier defined the law for determining the explosive limits. Lower Explosive Limit (LEL) represents the lowest concentration of gas or vapours in air which is able to generate the explosion in the presence of an efficient ignition source. It is considered to be the same as the Lower Flammability Limit (LFL). Upper Explosive Limit (UEL) represents the highest concentration of gas or vapours in air which is able to generate the explosion in the presence of an efficient ignition source. It is considered to be similar with the Upper Flammability Limit (UFL) [1]. For the optimal management of underground or surface industrial environments, confined, obstructed or open environments, is required to know the point which defines the monitored atmosphere in relation with the explosion triangle. For confined underground environments, monitoring the atmosphere and using the explosibility diagrams are required during the closure process and also for re-opening the area. For underground environments specific to active mine workings and for industrial environments located on the surface, monitoring the atmosphere and using explosibility diagrams are required permanently.

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The problem of industrial ventilation has arisen as a result of the serious pollution problems of both the industrial areas and the industrial premises. The polluted atmosphere, outside the industrial premises, can penetrate inside them naturally or through ventilation systems. The commissioning of a ventilation system occurs whenever a workplace generates more pollutants than those normally accepted by hygiene of work conditions, safety, health, etc. In order to be able to choose the correct ventilation system, a complete analysis of the workplace to be ventilated must be carried out so that the solution chosen to solve the problem of the exhaust, but also be well received by the user, respecting the thermal comfort of it. The paper presents the results of experimenting with a balanced tandem ventilation system with stable and unstable operation.

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