Self Contained Breathing Apparatuses (SCBAs) provide respiratory protection while in atmospheres considered to be Immediately Dangerous to Life & Health (IDLH). This may include confined and otherwise inhibited spaces, hazardous material spills, as well as a variety of First Responder activities. Typically, this includes using a face piece, compressed air tank and regulator valve. Standard SCBAs are rated in length of service, usually 30, 45 and 60 minute versions.