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Anthropic activities involve the extraction of the transformation and use of natural resources. During the process of extraction at the surface or underground of useful minerals, particles or gases resulting from the natural rocking or release from the rock mass appear in the working environment. The process of transforming useful mineral substances is carried out on the surface in enclosed enclosures, involving the use of complex technological processes. During the course of these technological processes, explosi...

The purpose of this paper is to determine the rate of methane (explosive gas ) and of carbon dioxide (axphysants gas ) in the mine workings of Praid salt mine. Currently in Romania there are six salt mines which exploit the salt through underground mine workings: Praid salt mine, Tg. Ocna salt mine, Slanic Prahova salt mine, Ocnele Mari salt mine, Cacica salt mine, and Dej salt mine. Of these six, in three salt mines occurred gas and salt eruptions: Praid salt mine, Slanic Prahova salt mine and Tg. Ocna salt mine....

A ventilation system is defined by performing air exchanges between the indoor and outdoor environment with the purpose of creating environmental conditions as close to the required thermal comfort conditions. Before installing a fan, it is necessary to analyze the space in which it is to be used and the method of compensating the exhaust air (mechanically with another fan or naturally with dimensioned grids). The most important factors to consider when choosing a fan are: the volume of the space, the number of sh...