Personal protective equipment (PPE) worn by firefighters serves two main purposes: protection from hazards and isolation from hazards. It includes clothing, helmets, eye protection, respiratory protection and other gear. PPE has specific requirements according to standards like NFPA 1971. Proper care, use, inspection and maintenance of PPE is vital for firefighter safety. Respiratory protection equipment includes supplied air respirators like SCBA and air purifying respirators; SCBA is the standard for interior structural firefighting. Limitations exist for all PPE that require mitigation through training and other measures.