Bathroom Exhaust Fan Calculation

[mesi55]

I've been given a arch plan with different types of bathroom arrangements. If I have same area of ventilation( ie volume) but instead of having one toilet I had three in other area, will my CFM different for each types of toilets? What is the rules of thumbs to calculate cfm (l/s) with different basin number?

Thanks
mesi

 

[willard3]

10 air changes per hour will control bathroom odors.

 

[dynamo78]

Try to calculate based on 50 CFM per fixture too. Some standards accept this too.What is the usage any way,if I may Ask?

Thanks

 

[mesi55]

They are in two type of projects. One is a childcare and the other one is call center.
Thanks

 

[mesi55]

Also how about if our toilet in public place? Is it different with private like an apartment or hotel room?

 

[dbill74]

What code are you designing to? Int'l Mechanical code requires 25/50/70 CFM per fixture depending on several factors, refer to your copy of the code for the factors and how they apply.

Do 2 calculations, one based on code minimum, and Willard's 10 ACH. Use the higher of the 2.

 

[317069]

what is your application

 

[aungkyawtun]

15 air change for marine

 

[IamMech]

35 lps asper Ashrae

 

[junagco]

Per ASHRAE standard 62.1

For Private use: 25 cfm per water closet and/or urinal (normal use)​

For Private use: 50 cfm per water closet and/or urinal (heavy use)​

For Public use: 50 cfm per water closet and/or urinal (normal use)​

For Public use: 70 cfm per water closet and/or urinal (heavy use)​

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