I'd ask the inspector! Better yet, find the exact code he's using, and see what the code says.
Evacuation of solvent fumes is a BIG inspection issue for nail salons. Be sure to take into account the cfm lost in every bend of the pipe. Be sure to provide for make-up air.
As I recall it, the ventilation needs to be present at each station; general room ventilation won't satisfy the requirement. They might let you put the fans on timers. I quoted one such job, only to have the owner choose to play inspection / responsibility games instead. Oh well.