Sorry I couldn't do it yesterday. But here is:
The first pictures demonstrate where the knob adjustments are located.
The second picture shows the location of the intake/exhaust system.
The third picture is the exhaust system fan and this fan is control by the "circulating air volume".
The last picture is the intake system, that is why is cover by a protective aluminum grill.
This is my personal dryer around 8 feet long. But some of the big dryer have the exhaust located on the middle top of the dryer and the air circulator (intake) at the bottom.
I hope that will help you understand some of the operating system of a dryer unit