What is the best bathroom fan to prevent mold?

The best bathroom fan to prevent mold is one that is properly sized for the room, has a high airflow capacity, and is equipped with a humidity sensor to automatically turn on and off as needed. Look for a fan with a minimum CFM (cubic feet per minute) rating of 50 for small bathrooms and 100 for larger bathrooms. Additionally, consider a fan with a quiet operation and energy-efficient features for optimal performance.