When installing a ceiling paddle fan, what must the outlet box be?

The correct answer is that the outlet box must be listed and marked as acceptable for fan support. This requirement is critical because ceiling fans generally weigh more than standard light fixtures and experience additional stresses due to their movement and operation. A box specifically designed for fan support can handle these stresses without compromising safety or stability.

Using an outlet box that is not rated for fan support could lead to potential hazards, such as the fan falling or the box becoming dislodged from the ceiling. Therefore, ensuring that the outlet box is explicitly marked for this purpose guarantees that it meets the necessary engineering and safety standards, providing a safe installation for ceiling fans.

Other types of boxes, such as plain plastic boxes or standard strong metal boxes, may not be able to support the dynamic load created by a ceiling fan. Additionally, while specialized soundproof boxes have their specific applications, they do not fulfill the requirement for structural support necessary for ceiling fan installations.