Which type of fan requires flexible weatherproof electrical cables according to NFPA 96 standards?

Hinged up-blast fans are designed to be used in situations where they need to be mounted on the roof or other elevated structures and are often exposed to various weather conditions. The requirement for flexible weatherproof electrical cables is primarily due to the necessity of ensuring safety and operational integrity in environments where the fans may experience movement or vibration, as well as exposure to moisture or other elements present in outdoor settings.

These flexible weatherproof cables help prevent electrical failures that could lead to fire hazards or other safety issues, aligning with the NFPA 96 standards that prioritize effective fire protection and ventilation control in commercial cooking operations. The unique structural characteristics of hinged up-blast fans, combined with their operational environment, necessitate the use of specific wiring solutions to maintain compliance with safety guidelines.