Final answer:
The subject of this question is Building Codes, which specifies the minimum requirements for building design and construction. The cross aisles in the main hallways should be at least 36 inches wide.
Step-by-step explanation:
The subject of this question is Building Codes, which falls under the topic of Architecture or Construction Technology. Building codes are a set of regulations and standards that dictate the minimum requirements for the design, construction, and occupancy of buildings. In this specific question, the cross aisles (aisle space in the main hallways) are required to be not less than 36 inches in width, as stated in the exception.
The minimum width requirement for cross aisles in shelters is 48 inches. The standard aisle spaces in shelters has been specified to be at least 36 inches, but cross aisles, which are the main hallways within these shelters, require a greater width to accommodate more traffic and potentially larger groups of people moving through. Therefore, the correct answer to the question is option 4) 48 inches.