Final answer:
Crawl space access openings should be at least 18 inches by 24 inches to allow for safe and manageable entry for inspections, repairs, and maintenance.
Step-by-step explanation:
The minimum size for crawl space access openings through the floor should be 18 inches by 24 inches. This size allows for individuals to enter the crawl space for inspections, repairs, or maintenance while also being able to remove equipment or debris from the crawl space if needed.
It is important for builders to adhere to this requirement to ensure that access to the crawl space is safe and manageable.