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La presión dinámica del aire en el interior de un conducto es:a) siempre inferior a la presión atmosférica exterior.b) en el tramosituación entre el ventilador en extracción y la campana de entrada es siemprenegativa, inferior a la atmosférica.c) no varía en todo el tramo si se mantiene la misma velocidad de circulación del aire.d) positiva o negativa según se trate del tramo de aspiración o de impulsión del sistema de extracción.
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