When the weather begins to warm up a bit I would like to build a deck with an integrated pergola. This will be part of a larger project and the plans have been produced by an architect. We would like to install a ceiling fan into the pergola, but that it turning out to be more complicated than I had anticipated.

There are many UL wet location listed fans available, and of course we'll wire the deck with either UF rated cable or THNN/THWN running through conduit, but what I cannot figure out is what sort of electrical box to use and as such, how to attach the fan the to pergola rafter.

Am I missing something? Are there wet location listed fan boxes? Can I build out a box around the rafter to protect the junction box/connections and then use a pancake box? I know it has been done, I just don't know how people pull it off.

Any help?

I can't help you with the code for outdoor wiring, that is TK's purview. However I can recommend the Envirofan Platinum Line as a great outdoor fan. It is rated to withstand direct spray, moves a LOT of air, and is reasonably priced.

Industrial Ceiling Fan Brand Guides and Reviews - at Ceiling Fans 'N More (http://www.ceiling-fans-n-more.com/industrial-ceiling-fan-brand-guides-and-reviews.php)