The present Invention relates to a method for Protecting at least a portion of a Space content,Against the incursion of External Fluid through at least one opening to the Space content,Said method is characterized that it comprises; a Fluid flowing at least selected, in sheet form,In proximity to or directly through at least a portion of at least one opening at the Space content; where the thickness or depth of at least one layer of fluid and selectedThe source of this Fluid Layer, is at least approximately 0.05 times the distance through the opening in the main direction of flow of the Fluid layer in the source of the Fluid Layer, where the widthTransverse to the direction of Fluid Flow of the laminar FLUID FLOW at its Source, it is at least approximately as large as the maximum width,Transverse to the direction of Fluid Flow, the portion of the aberrtura, and where at least one FLUID FLOW has selected a number of force which varies approximately 0.05 to 1.0
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