What must be present on the installation label for a fixed ext. system?

The installation label for a fixed extinguishing system must include the signature of the person responsible for the final test. This signature serves as a crucial verification step indicating that the system has undergone the necessary checks and tests to ensure its proper functioning and compliance with safety standards. This process evaluates whether the extinguishing system is installed correctly and is operational, providing assurance that it will perform effectively in the event of a fire.

The presence of this signature is essential for accountability, as it identifies the technician or personnel who performed the final inspection and testing. This also creates a clear record of who is responsible for certifying that everything meets the required standards and regulations.

While other options, such as the manufacturer's or installing personnel's signatures, might pertain to various documentation or processes surrounding the system, they are not specifically required on the installation label itself for a fixed extinguishing system. Similarly, a certification number, while important for tracking and verification purposes, does not fulfill the specific requirement represented by the correct choice.