108.631—Fixed fire extinguishing system controls.
        
        (a) 
         Each cabinet or space that contains a valve, control, or manifold of a fixed fire extinguishing system must be marked by one of the following: “CARBON DIOXIDE FIRE APPARATUS”, “FOAM FIRE APPARATUS”, or “WATER SPRAY FIRE APPARATUS” in letters at least 5 centimeters (2 inches) high.
    
    
        
        (b) 
         Instructions for the operation of a fixed fire extinguishing system must be posted next to a fire apparatus described in paragraph (a) of this section.