RN/ A 1603 FR is a type 2 Self Contained Breathing Apparatus specifically designed for firefighting. RN/ A 1603 FR adds the highest degree of safety and comfort to the efficiency, versatility and simple use of the MK2 System, as well as the astonishing field of vision of the Spasciani TR 2002 A mask. Materials and technologies employed in FR models are of the highest standard and they are all used to make the breathing apparatus components very high resistant to flames and able to resist to Flash Over test as per EN 137:2006 standard. RN/ A 1603 FR is fitted with an automatic demand valve which keeps a positive pressure in the mask thus avoiding any possible inward leakage of contaminated air from the outside. Should it become necessary, the positive pressure mode can be activated by acting on the special button that acts as a supplementary air command, too. The demand valve is connected to the medium pressure hose by means of a quick coupling which allows it to be disconnected very easily for maintenance. The medium pressure hoses of the reducer and of the demand valve are covered by a special Kevlar sleeve to protect them from flames. RN/ A 1603 FR takes advantage from the unique MK2 System warning built into the demand valve. This is activated when the pressure left in the cylinder drops below 55 bar. The signal originates from a sounding vibration caused by every inhalation. In this way the full capacity of cylinder is made available to the user for breathing. The acoustic warning is related to the respiratory frequency of the user and allows the user to distinguish his own signal from those emitted by nearby fellows or noise (Self-Test Function). The location of the warning device protects it from frost or dirt.