restroom/toilet ventilation

[ASSADEQ]

As per Mechanical Code the for restrooms,the level of exhaust typically is 50 cfm per water closet or 2 cfm per square foot.

What is exhaust (cfm) of wash basin/lavatory?

In case if cooling is required, how to size the supply cfm of the restroom ?

 

[trashcanman]

Exhaust is still 2 CFM/SQ.Ft.

Supply air CFM = effective room sensible heat/(1.08*dt)
dt = room design temp (Deg.F)-lvg. coil db temp (Deg.F)
sensible heat in BTUH

 

[ChasBean1]

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...

 

[ASSADEQ]

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.

 

[ChasBean1]

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.