How high can an opening under the bottom of a pool enclosure be?

The maximum allowable height for an opening under the bottom of a pool enclosure is important for safety reasons, particularly to prevent small children from gaining unauthorized access to the pool area. The correct height of 4 inches is established as a standard to maintain a balance between accessibility for maintenance and ensuring security against accidental entry by young children.

Allowing an opening higher than 4 inches could increase the risk of children being able to crawl underneath the enclosure, thereby compromising the safety that such barriers are intended to provide. Conversely, having a height lower than this standard might not be practical for maintenance purposes, so the regulation provides a clear guideline that aims to ensure both safety and practicality.