The fan board is screwed right on the side of the fan shroud. This board allows the charger to turn the fan on and off as required.
The pack is cleaned in the mounting area, so the epoxy sticks strongly.
The temp board is first coated with spray wax, then pressed down into the soft epoxy putty.
Waxed screws are threaded into the epoxy through the board mounting holes. When the epoxy is set, the board and screws can be removed from their form fit mounting pads.