Which component is essential for verifying the effectiveness of a firestop installation?

The effectiveness of a firestop installation is determined by multiple factors, making all the mentioned components essential. Documentation is crucial as it provides a record of the materials used, installation procedures followed, and compliance with relevant codes or standards. This ensures that all aspects of the firestop installation meet the necessary requirements.

Visual inspection is another key component, as it allows for an on-site verification of the installation's integrity. Through visual checks, installers or inspectors can identify any visible defects or breaches that could compromise firestop performance, such as gaps, improper materials, or inadequate sealing.

Fire testing is a critical part of the verification process as well. It involves subjecting the firestop installation to specific fire scenarios to assess its performance under actual fire conditions. This testing demonstrates how well the installation can prevent the spread of fire and smoke through joints and penetrations.

Together, these components – documentation, visual inspection, and fire testing – provide a comprehensive approach to ensuring that firestop systems are installed correctly and will perform effectively in protecting life and property during a fire. Therefore, the correct answer encompasses the necessity of all these elements.