Ceiling fan boxes must be marked to indicate the maximum weight they can support. What is the minimum weight that must be specified?

The minimum weight that must be specified for ceiling fan boxes is 35 pounds. This specification is essential for ensuring the safety and structural integrity of the installation. Ceiling fans can vary widely in weight, and some larger, more decorative fans can approach or exceed this weight threshold. By requiring ceiling fan boxes to be marked for a minimum of 35 pounds, the safety standards ensure that the electrical box can adequately support the fan without risk of failure, which could lead to a dangerous situation if the fan were to detach from the ceiling during operation.

Additionally, this specification takes into account any additional forces that may act on the fan during operation, such as wind forces generated by the fan blades and vibration. By adhering to this standard, installers can ensure that the ceiling fan is securely mounted, significantly reducing the risk of accidents and injuries.