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La longitud equivalente total de un tramo de impulsión de aire de un sistema de ventilación para climatización de despachos y oficinas:a) siempre es inferior a la presión atmosférica exterior.b) el tramo situado entre el ventilador en extracción y la campana de entrada es siempre negativa, inferior a la atmosférica.c) no varía en todo el tramo si se mantiene la misma velocidad de circulación de aire.d) positiva o negativa según se trate del tramo de aspiración o de impulsión del sistema de extracción.
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