No it’s not just wanted to make absolutely sure you got the flue. Some fancy fireplaces will have doors and vents under them to allow for control (let the fire get roaring or slow it down) since you said you’re not used to fire places just wanted to make sure you didn’t think that was the flue. (No offense to you, just covering all bases) the vents on the floor really aren’t needed unless you have solid (glass) doors in front of the fireplace.