jar546
CBO
What is the required CFM for an 11'x14' public restroom with 2 water closets and 2 urinals?
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Public Restroom Mechanical Ventilation (Exhaust)
- Thread starter jar546
- Start date
Paul Sweet
SAWHORSE
200 CFM if run continuously during occupied hours. 280 CFM if intermittent (occupancy sensor control?).
Yankee Chronicler
REGISTERED
IMC 2021, Table 403.3.1.1, Footnotes e and g: 50 cfm per fixture if continuous, 70 cfm per fixture if intermittent.
(2+2) x 50 = 200 cfm continuous
(2+2) x 70 = 280 cfm intermittent
What I often see is a supply air register in a toilet room that runs continuous, pushing in more cfm than the intermittent (switched) exhaust fan. This leads to a positive pressure in the toilet room, which pushes air from the toilet room out into the surrounding space, from where it gets recirculated. And recirculation of air from public toilet rooms is prohibited (footnote g).
(2+2) x 50 = 200 cfm continuous
(2+2) x 70 = 280 cfm intermittent
What I often see is a supply air register in a toilet room that runs continuous, pushing in more cfm than the intermittent (switched) exhaust fan. This leads to a positive pressure in the toilet room, which pushes air from the toilet room out into the surrounding space, from where it gets recirculated. And recirculation of air from public toilet rooms is prohibited (footnote g).
jar546
CBO
Looks like we are all on the same page with this one. Anyone disagree?
Gregg Harris
SAWHORSE
Same issue with commercial kitchens