Supply air to a swimming pool and associated dock areas shall not be recirculated unless such air is _____ to maintain the relative humidity of the area at ___ percent or _____.

The correct answer emphasizes the importance of controlling humidity levels in areas such as swimming pools, where high humidity can promote mold growth, reduce comfort, and impact the overall air quality. Adequate dehumidification is crucial in maintaining a healthy environment in these spaces, as excessive moisture can lead to structural issues and affect the comfort of users.

In this context, the requirement for the air to be dehumidified ensures that the relative humidity does not exceed 60 percent. This specific level is significant because it helps prevent the detrimental effects associated with higher humidity levels, such as condensation on surfaces, growth of pathogens, and discomfort for individuals using or working in the area.

Maintaining relative humidity at 60 percent or less creates a more comfortable atmosphere and promotes better air quality in aquatic facilities, ensuring that both the pool environment and the associated areas remain safe and pleasant for occupants.