A single switch or set of switches shall be provided for the emergency shutdown of all negative air equipment located in the containment area. This switch or set of switches:
1. Shall be for emergency use by Fire Department personnel.
2. Shall be located in a non-contaminated area near the exit from the decontamination station and shall be clearly identified using a sign with minimum 3" high x 1/2" wide lettering on a contrasting background. The sign shall read “NEGATIVE AIR MASTER SHUT-OFF.”