BUT if you calculate you need 200 cfm supply air for whatever reason and you also decide to meet code with 50 cfm exhaust, it's a bad design. These spaces should remain negative to typical surrounding areas...
in case if cooling is required in restroom, how to maintaine -ve pressure and suppling cooling at the same time with out effecting the comfort requirment. is there any guides?
regarding the required exhaust cfm for wash basin/lavatory, for the reason of removal of humidity is there any fixed exhaust rate? I think 2 CFM/SQ.Ft.is not enough espically in humid weather.
Don't look to perfectly condition a restroom. Or a locker room. Exhaust what is needed to remove odors and steam from showers and make up that volume via transfer grilles connected to a conditioned space.