As applied to fire fighting: Multiple elements of clothing and equipment, including coats, trousers, coveralls, helmets, gloves, footwear, and interface components, designed to provide a degree of protection for fire fighters from adverse exposures to the inherent risks of structural fire fighting operations and certain other emergency operations. NFPA 1851, 2001 ed: As applied to chemical/biological terrorism: Ensemble is a shortened term for Chemical/Biological Terrorism Incident Protective Ensemble. NFPA 1994, 2001 ed