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Supplied air systems feed breathing air to an entry team from outside the space, which is the only workable answer when the atmosphere cannot be made safe and the entry runs longer than a cylinder will last. The regulator, the hose and the air source all have to be rated as one system.
This category is built around Air Systems International equipment: breathing air hose in 3/8 in runs, the Multi Pak Rescue and Tech Rescue Cart, Saddle Vent manhole and tank ventilation, ducting, and contractor grade axial and explosion proof fans.
Size the system by the number of entrants, the hose run from the air source to the furthest point of the space, and whether the location needs explosion proof equipment. Ventilate before and during entry with confined space ventilation fans, and confirm the atmosphere with a gas detector before anyone breaks the plane.