Internal Pressure loading on structures enclosed within a building?

[Forgot2Yield]

Hi, I know that there is usually a minimum internal wind pressure that you design certain partitions for within buildings (~5psf), but I was wondering if you need to apply a wind load to an entire structure within a building for the overall base shear and overturning moment reactions of that structure? I would assume that you would not need to do this because the internal pressure would not be acting in one direction on the structure (like a wind load outside would do), but rather more likely to act on all sides of the structure at the same time cancelling itself out.