Warmth comes off it if you hold your hand next to the fan but it's not noticeable at all if it's on your desk and your close to it.
I did have an Ultra go faulty though after 6 months and it overheated and melted the casing 😬 there's been a fair few updates since then though that seem to list rectifying overheating issues. Replaced with a Supra and had zero issues so far.