Before you start determining the installation of HVAC equipment, I would recommend you take some courses and only report on what you know is not right.
IAW SOP you are only required to run the HVAC from the T-Stat. No further evaluation is required or expected.
If you don’t know what you are looking at, I would recommend that you do not get involved, as this is not a requirement of HI’s.
You will find this damper in oil fired boilers/furnaces. It has a purpose. Just because you have not see it before, does not mean there is a problem with it.