Supply and Return Vents Code?

Are both supply and return vents required in a Massage Therapy Center?  I work as an RMT and most of the massage rooms have both supply and return vents, but a couple only have one vent and the rooms get unbearably hot and stuffy with opening and closing the hot towel cabby's and it makes it uncomfortable and difficult to breathe.  Anyone know if there is any such code?

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