Which data must be documented about combustible materials in a flame effect plan?

In a flame effect plan, it is crucial to document that combustible materials have been rendered flame retardant. This is essential because the primary concern when utilizing flame effects in the presence of an audience is safety. The use of combustibles can pose significant fire risks if not properly treated; therefore, ensuring these materials have undergone a flame retardant process is a key safety measure. This documentation demonstrates compliance with safety standards and helps minimize the potential for fire hazards during a performance.

The other options, while potentially relevant to various aspects of production, do not pertain directly to the safety measures outlined in the NFPA 160 Standard. Sourcing from local suppliers, cost analysis, and expected lifespan, while important operational considerations, do not directly impact the safety of flame effects as ensuring the flame retardancy of materials does. Ultimately, prioritizing safety through proper documentation of flame retardant treatment is vital in mitigating fire risks in theatrical and performance settings.