Questions regarding the definition of semi-open workshops in the fire protection standards for fine chemicals?

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In the fire protection standards for engineering design of fine chemical enterprises, a semi-open factory building is defined as one that has a roof, with its exterior enclosure constructed from evenly distributed closed walls (including doors and windows)【What does \"evenly distributed\" mean? Is it possible for the distribution to be uneven? 】, the area it occupies shall not exceed 1/2 of the surface area of the building’s exterior envelope (excluding the roof area).【I’m not sure – is the surface area of the exterior envelope simply the total length of the exterior envelope multiplied by its height?】 】or the perimeter it occupies should not exceed 1/2 of the perimeter of the building’s exterior envelope【I’m not sure how to calculate this exactly Since it is semi-open, the exterior enclosure certainly doesn’t enclose the entire factory building; then how should the perimeter of the exterior enclosure be calculated? It refers to a productive building in which the area occupied by function rooms with enclosed protective structures on any given floor does not exceed 1/2 of that floor’s total area, but is greater than 5% of that floor’s area. I have some questions regarding the learning* standards; I would be grateful if an expert could answer them.