So you're thinking of installing one or more fans outdoors over an enclosed patio or perhaps in a gazebo. This of course means that outdoor Hunter ceiling fans will be what you select from, if indeed Hunter fans is what you will be using.
So then just what is it that makes an outdoor fan and outdoor fan? What special adaptations “are or aren't” included in them when compared to an indoor unit? Also, how much weather will an outdoor fan endure?
The simple answer to these questions is that outdoor fans have a weather resistant coating or are made of materials to prevent rust and their blades are made of materials that won't corrode or warp from exposure to water. Also the casing will be configured in a way such that water cant become trapped in it.
Features like sealed stainless steel bearings or other modified lubrication systems also help to make better quality outdoor fans more able to stand the rigors of the outdoor environment. Even so, remember that even outdoor fans should be mounted under cover.
Now a standard lifetime guarantee on the motors in all Hunter outdoor ceiling fans is your assurance that the people who make these fans have a lot of confidence in them. They also come with a five year guarantee on all parts.
You can even find some fan companies that are marketing outdoor fans that are rated “wet”, which means that they're capable of enduring direct water contact. So is this really possible? Also, just how “wet” is the wet that they are talking about?
In my opinion, these types of rating systems are more of a marketing gimmick than they are relevant to any real practical applications. For instance, it's just hard to imagine a situation where a fan would be mounted in an uncovered setting. What would it mount to??
Besides, you have to bear in mind that water is not the only enemy of the outdoor fan. Hang one out in the direct elements and you'll have the wind to contend with, as well as possibly rodents chewing on it or bugs nesting in it.
Now find a wet rated fan that's unconditionally guaranteed for life and I'll be impressed. However; until then, I take the stance that all ceiling fans, including Outdoor hunter ceiling fans have a life span and how they are treated does play into how long that life is.