If you're a fan fanatic (yes, we thought of all that all by ourselves), then you've probably heard of Sunon, maybe even bunged one or two of their fans into your case, or seen them shipped with a heatsink. But you probably haven't seen any fans quite like thse...
The "largest" fans are suitable for embedded devices, optical drives and various other consumer and commercial applications. But what's really quite breathtaking (if they're blowing in the right direction) is how miniscule Sunon can go...
This little'un is a diminutive 8mm in diameter and is designed for use in very small devices like USB sticks, or in other scenarios where there needs to be some active airflow in a really tight space. We have no idea what the CFM on it is, but we're guessing it'll be somewhere between 0 and 1.
If you can think of a good use for one, then answers on a postcard (or in the forums) please. Looks like we've now covered the full spectrum of fan sizes. You can't accuse us of not being thorough!