Final answer:
The question relates to the standard size required for a crawl space access opening, which according to most residential building codes is typically 18 inches by 24 inches. These dimensions ensure adequate access for maintenance or inspections.
Step-by-step explanation:
The question pertains to the minimum dimensions required for an access opening in a crawl space. While the question phrased does not provide a specific answer, it references to a general requirement that a crawl space access opening should meet for adequate access. Typically, building codes and standards would dictate these dimensions to ensure safety and accessibility for maintenance or inspection purposes.
In absence of the exact code reference from the question, it's worth noting that building standards have evolved, and the current generally accepted dimensions according to most residential building codes would be 18 inches by 24 inches. However, depending upon the jurisdiction and the date of the building code in use, these minimum dimensions could vary slightly.