I have had a fan on a covered deck for 12 years and never do anything for it except clean the blades. I don't mark the blades either just remove, wash and reinstall. We use it all year summer or winter not only for light but to remove the smoke from the grill, out from under the roof. It wasn't even an expensive fan, I think less than $60.00. I figure if it fails it's cheaper to replace than spend a fortune for a great one.