The popping chamber where heat and air are applied to the popcorn kernels

Below the chamber is the heating element and sheath which directs the heat into the chamber.

A thermometer to measure the heat of the chamber.

The PCB and wiring that connects the power cord to the fan and heating element.

The fan moves air around the sides and up through the heating elements and into the chamber.

The heating element is sandwiched in order to prevent contact with plastic or other materials that might burn.