The Peltier module is installed on the back, at the top of the fridge. Thus, air which is cooled in this area will then travel down through the rest of the fridge’s cavity.

Peltier effect modules, also known as solid-state heat pumps, used to be exotic tech but are now quite common. They are actually the reverse of the Kelvin effect.

Way back I used a rather powerful peltier module to cool my GPU to sub zero temperatures. A secondary watercooling loop removed the combined heat of the GPU + peltier (in)efficiency. The GPU died ...