I have wired maybe 7 Valvoline Instant Oil change places and they all had air exchangers that drew air out of the basement to conforn to code. This is the only places I have ever used this system. Even a body shop I wired last year with 2 floors.
Any spray booth I have wired avoid anything inside it at all to avoid the code requirements. They have glass on the ceiling with lights over the glass. The mixing room does require a recpt for the computer and a recept for the paint mixers which cost plenty.
