How should rooms containing bathtubs or showers be ventilated?

Rooms containing bathtubs or showers should utilize mechanical means of ventilation to effectively manage moisture and prevent issues related to humidity, such as mold growth and damage to walls and fixtures. Mechanical ventilation systems, such as exhaust fans, provide consistent air exchange that helps to quickly remove steam and moisture generated during bathing. This is particularly important in areas where natural ventilation, such as windows, may not be sufficient to achieve proper air circulation or may not be feasible due to the room's design.

Natural ventilation alone may not provide the necessary airflow or could be affected by external conditions, making mechanical ventilation more reliable for maintaining a healthy indoor environment in these types of rooms. While some designs may allow for both methods to be employed, the effectiveness of mechanical ventilation in removing humidity in a timely manner makes it the recommended approach for these specific environments.