What specification must the outlet box meet when installing a ceiling paddle fan?

When installing a ceiling paddle fan, the outlet box must be specifically listed and marked as acceptable for fan support. This requirement ensures that the box can safely support the weight and motion of the fan during operation. Ceiling fans generate a significant amount of torque and vibration, so the outlet box needs to be constructed in a way that will securely hold the fan and prevent it from becoming loose over time. Selecting a box that is rated for fan support provides assurance that it has been tested for strength and stability, minimizing the risk of failure.

In contrast, while aesthetic qualities and materials may have their place in selection, such as being decorative or made from plastic, these factors do not pertain to the critical safety and structural requirements necessary for fan installation. Moreover, even though some outlet boxes may be labeled for indoor use, this designation does not guarantee that they can support the dynamic load of a ceiling fan. Therefore, the key specification is that the box must be appropriately marked for use with ceiling fans to ensure proper and safe installation.