Tunnel systems are enclosed areas that typically become packed with people at predictable times during the day. Air currents above ground, as well as those generated by the movement of cars or trains through the structure, accelerate the spread of smoke or gases through the tunnel and up to street level through the ventilation system, exposing many people to toxic fumes. This presents significant challenges in a fire emergency, but also during any kind of incident in which air quality is compromised.
A continuous source of air is supplied to the FARS through secure, monitored air connection panels located on the exterior of the structure at ground level. The fire department’s mobile air unit connects to the system via these panels and provides a constant supply of air.
An onsite air storage system provides first-in crews with immediate and sustained on-demand air refill capacity ranging from 50 SCBA to 250 SCBA refills prior to mobile air arrival. The built-in air monitoring system provides real time 24/7 monitoring of the systems air quality.
We offer two types of filling methods in accordance with the National Fire Protection Association (NFPA) and the preference of the authority having jurisdiction, based on its operational need, policies and procedures.
The emergency fill method features an interior fill panel that uses the RIC UAC fitting and allows firefighters to refill their air cylinders under full respiration even if they are in an IDLH environment. Firefighters simply attach a quick fill connection from the air panel to their SCBA. These interior air fill panels allow for at least two cylinders to be filled simultaneously.
The rupture containment method features the interior fill station and incorporates a rupture-proof containment station and an air control panel in addition to the quick fill connection for instant access. These rupture containment air fill stations are placed in protected areas such as cross-passages throughout the tunnel and secure closets adjacent to the platform level.
For a case study on FARS in a tunnel system, click here.