Respiratory Equipment

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SCBA = self-contained breathing apparatus = a respirator worn to provide an autonomous supply of air in an toxic atmosphere from a gas cylinder

voice amplifier = device attached to an SCBA that makes a person's voice louder

harness = a set of straps which fit under a person's arms and fasten round their body in order to keep a piece of equipment fixed

oxygen-deficient = containing low levels of oxygen

positive pressure = a system within an SCBA that provides a constant stream of oxygen

fume = a gas that is emitted from something and usually refers to smth toxic

lock-and-release device = a mechanism which allows to take on/put off garment fast

PASS = Personal Alert Safety System = a device that alerts others in the area loudly that the firefighter is in danger

point of no return = the stage at which it is no longer possible to stop what you are doing and its effects cannot be avoided or prevented


See also

Firefighter's Personal Equipment 

Firefighter's Anatomy | Part 1  (https://t.me/espedition/661)

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.