Sit in front of your fireplace.  Stick your head in the fire box and look up.

 

What do you see?

I see a circle damper with NO handle on it.
I see a circle damper WITH a handle on it.
I see a rectangular damper with a handle sticking down the center.
I see a rectangular damper with a handle down the side.
I see a rectangular damper with NO handle on it
I see chains or cables coming down.
I just see an empty hole going up. (No damper)
I have something completely different