Airbus A320 Cockpit Tour: #31 - Ventilation Panel: What do all those buttons do?!

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In this segment we will discuss the Ventilation section of the Airbus A320 Overhead.

The avionics ventilation system is fully automatic.
It cools the electrical and electronic components in the avionics compartment and on the flight deck,
including the instrument and circuit breaker panels. It uses two electric fans to force the circulation of
cooling air.
Whatever the configuration of the avionics ventilation system is, a part of the avionics ventilation air
is sucked from the cockpit through the different cockpit panels.

FANS
Two electric fans continuously circulate air around the avionics equipment, when the aircraft is
electrically supplied.
The Fan Speed Controller (FSC)  controls the avionics ventilation fan speed as a function of
temperature::
1. High speed when the ventilation air temperature is above +40 °C (104 °F )
2. Low speed when the ventilation air temperature is below +35 °C ( 95 °F)
SKIN AIR INLET AND OUTLET VALVES
These valves admit air from outside the aircraft and evacuate hot air from the avionics equipment.
SKIN EXCHANGE INLET AND OUTLET BYPASS VALVES
These valves enable air to circulate between the avionics bay and the space under the cargo
compartment floor.
AIR CONDITIONING INLET VALVE
This valve opens to enable the air conditioning circuit to supply fresh air to the avionics bay.
SKIN EXCHANGE ISOLATION VALVE
This valve connects or isolates the skin heat exchanger.
AVIONICS EQUIPMENT VENTILATION CONTROLLER (AEVC)
The AEVC controls the operation of all fans and valves in the avionics ventilation system.