Queda prohibida la ventilación por difusión, excepto en túneles o galerías avanzadas hasta 10 metros a partir de la atmósfera libre o de la corriente principal de ventilación, donde no haya presencia de metano o de gases contaminantes de que trata el artículo 2º de éste reglamento, ni peligro de acumulación del mismo.
Decreto 1335 de 1987 →In force
Article 29
Decreto 1335 de 1987 · mediante el cual se expide el reglamento de seguridad de las labores subterráneas.
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