Answer:
Constant Volume Forced Air system
Step-by-step explanation:
A Constant Volume Forced Air system is a form of a mechanical system that is considered the most basic type of system. It is most common in use and high yielding in the application.
It is characterized by using any natural gas, oil, and electricity as the fuel to power the generated force.
Hence, in this case, the correct answer is "Constant Volume Forced Air system."