Respiratory Protective Equipment, also known as "RPE", is a form of personal protective equipment designed to protect the wearer from a variety of airborne hazards in the form of gas, mists, fumes, dust or vapours.

A Self Contained Breathing Apparatus (SCBA) also referred to as a Compressed Air Breathing Apparatus (CABA), a Supplied Air Breathing Device (SABA), or simply a Breathing Apparatus (BA) is a wearable device worn by Fire, Rescue and other professions that may require the need for immediate supplied air.

These devices are designed to provide breathable air when in environments that pose an Immediate Dangerous to Life or Health (IDHL) atmosphere.