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I don't remember, but I have it for quite a few years (over 5-6), without any problems.
The only thing that bothers me is that the first speed is loud enough to have it in the room, but it is also stronger than necessary!
It should be more relaxed so that it can just provide a breeze and allow you to sleep comfortably.
But it is so intense that it is comfortable to be felt from a distance in a living room type of room where you can't sleep.
And there I have it and it does an amazing job constantly on the first speed.
I have used it at night in some rented places that didn't have air conditioning and it was all good.