EL,They use what is called a 'Peltier' device.(sort of like 2 metal plates insulated from each other. By passing current thru it in one direction, you get one side of it to heat & the other side to cool. This peltier unit is a SPECIAL build. They are tiny in comparison to what Co's. like 'Oatley Electronics' etc sell..& AFAIK only cool the chip, which is all that's needed. The fan looks like a standard sized one, may be a bit smaller. This is simply used to remove the heat from the 'HOTPLATE'.
, so making the cool plate cooler.
Hard to tell the scale.
L.
See attached...Sorry Mike, it's 130 k. Lose res if any smaller.