What type of breathing apparatus connects to a supplied air line?

The correct answer is SAR, which stands for Supplied Air Respirator. This type of breathing apparatus is designed to provide clean air to the user through a hose connected to an external air supply source. This setup allows for a continuous flow of air, which is beneficial in environments where the air may be contaminated or not safe to breathe.

SARs are particularly useful in rescue operations, industrial work, or any scenario where extended use and a reliable air supply are critical for safety. The supplied air line ensures that the user has an uninterrupted supply of breathable air, making it suitable for longer periods spent in hazardous situations.

In contrast, other options like SCBA (Self-Contained Breathing Apparatus) are designed for situations where an internal supply of air is necessary and do not connect to an external air source. FFR (Filtering Facepiece Respirator) and APR (Air-Purifying Respirator) rely on filters to clean the inhaled air and are not designed to provide a continuous external air supply. Each of these alternatives serves different purposes and environments, highlighting the importance of selecting the appropriate type of respiratory protection based on the specific risks present.