Which description fits a Group III flame effect?

A Group III flame effect is categorized as an attended flame effect that is typically set up for temporary use and has limited operational duration. This classification indicates that the effect requires supervision while in operation, ensuring that safety protocols are adhered to and that any potential hazards can be immediately addressed. Such effects are generally utilized in performances or events where they can be operated for brief periods under controlled conditions, emphasizing the importance of attention and management to ensure audience safety.

This selection accurately reflects the characteristics of Group III flame effects as defined by the NFPA 160 standard, which emphasizes the need for operational controls and direct supervision. Attributes like being attended and having limited operational time are crucial factors that distinguish these effects from others, particularly regarding audience safety and compliance with safety regulations.