Airsupply
What about this question?
What is the purpose of a mixing valve in an air conditioning system?
This question has alternative 3 as the correct, canīt alternative 4 also be correct? If not, are there a mixing valve to both cockpit and cabin?
1Control the supply of hot, cool, and cold air.
2Combine ram air with conditioned air.
3To maintain the selected cabin temperature
4To maintain the selected temperature in cabin and cockpit