Well, the MIM refers to it as "fan" - but blower indeed might be more appropriate.
I've pondered if the IBM 5100 hinged flip-over concept is genius or ridiculous

On the positive aspect, once folded closed, you still have access to all the pins of the system (on the back of the A1) -- so that's nifty for servicing the system. But on the negative, it is a lot of weight and complexity. Couldn't they have mounted the A1 board "normal" and just had an access panel on the bottom side of the case? Not judging -- certainly there was a lot of things they "could" have done, and however things went, this is what they came up with the time they had. Was the original SCAMP prototype a flip-out board?
BTW, I think in the TV series "Halt and Catch Fire" -- they didn't mention the 5100 explicitly, but I think they tried to have a scene that paid tribute to its fold-out design (the scene where Donna comes up with the idea of folding the boards together, think that was in 1st or 2nd season).
But overall, I think the great thing about the 5100 was the software it had - the microprograms. The hardware may not been particularly groundbreaking.