Ok, that was why I asked if you had a split system a/c or a self-contained a/c (all in one unit outside).
The self contained is a Package Unit, just a different name.
I was trying to make sure you had that because the damper wasn't needed otherwise.
Now that we're on same page, LOL, let me check on that for you.
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?