An improved breathing apparatus to increase the safety of firefighters and rescuers

When performing emergency rescue operations and extinguishing fires, firefighters and rescuers are faced with exposure to fire hazards, as a result of which they may need to send a distress signal. To improve the safety of firefighters and rescuers, an improved insulating breathing apparatus is proposed, which allows a distress signal to be sent during emergency response and rescue operations. The design of the apparatus provides a device for a forced air supply to an alarm whistle. In an accident, the distress signal must be heard by other firefighters. A mathematical expression for determining the distance from the sound source depending on the sound pressure levels generated by the signal is obtained. The solutions will ensure the timely delivery of a distress signal to firefighters and, consequently, increase their safety.