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Because the occupational risk expressed the possibility of ending up in a (possible) danger of injury and/or occupational illness, it can represent a criterion of qualitative appreciation of the accomplishment of a human action, indicating how it may produce undesirable effects, materialized by human and material damage. The risk associated with a human action is determined by a multitude of risk factors, both of internal nature (manifested by human error) and of an external nature (technical equipment and related...

The main role of ventilation systems and especially air conditioning systems is to create indoor conditions and air quality inside the rooms that are independent of external atmospheric influences. The sizing of ventilation systems and especially of air conditioning systems is done, in most cases, by considering the climatic elements as a basis for calculation. The real limit to air quality insurance it consists in maintaining in the air certain concentrations of harmful substances which do not endanger human heal...