Fans are a popular addition with outdoor patios, of course you do need to have the available height to make them a viable accessory. The wiring for these can be pulled through at the time of the patio roof build to then be hardwired by a registered electrician.
It is essential that electrical conduit or what they call a non-migrating wire is used when running 240v wires through the insulated panel. As there is such a great variety of fans on the market, we leave the choice up to our customers to purchase prior to installation of their patio.
Please make sure that your fan is designed for exterior use which will give you a much better long term investment.