All the reason to have an independent vent over it like it sounds will be put over the welding table(s). (So is metal getting a new kickass welding table providing fixturing and all that other good stuff??) 
You are probably right the vast majority of the time.
Interesting story I think you’ll find funny. I was in there about 5-6 months ago and it was after someone had just used the welder and I was on the plasmacam setting up a cut, prior to putting in my consummables and placing my metal. The room was a bit hazy at the time. A young man who I’ve seen there quite a bit at the time came in like a boss and looked around and mentioned how cloudy it was and that I needed to turn on the plasmacam vent. I gave him one of those looks like, “you talkin’ to me?” 
. So after about 3 long seconds of awkwardness, I pointed to the vent switch and told him to go ahead and turn it on. He then gave me the look so I gave it back and then he turned around and walked out…Lol.
After setting up the cut, about 5 minutes, I turned on the plasma vent. Then put down the metal and cut it then powered off the plasma vent and left.
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