combustion air and exhaust appear merged

I am using Horizon software.
Limitations cover the area of concern you are mentioning Robert.
Always try to take photos on an inspection to document conditions even if you don’t include them in a report. It can get your butt out of a pickle if say there are belongings, throw rugs, furniture, etc. that cover a problem which become obvious when the owners move out.
I also take a movie of the home on the why out. I leave via the garage if I can and take a shot that it is operational. Springs and all the hardware.
If you can modify your HI software like HIP, then create DESCRIPTIONS/LIMITATIONS/RECOMMENDATION AS ELEMENTS IN EACH SECTION.
Just an idea.