What is the code for bathroom ventilation?
Sunday, March 1, 2020
You can opt for natural ventilation, with a window having a minimum area of three square feet and half of it openable, or provide artificial light and ventilation via a switched exhaust fan rated at a minimum of 50 cfm (cubic feet per minute) or a continuous one at 20 cfm. The vent must terminate at the exterior of the home (not the attic) and can't be directed onto walkways. The requirement also applies to a half-bath (toilet room). All of this is per the 2018 International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC) at R303.3 and M1507.4.
Also, see our blog posts Does a bathroom exhaust fan need to be GFCI protected by code? and When did the building code begin requiring bathroom vent fans to discharge to the exterior (not the attic or crawl space)? and How can I check to see if my bathroom exhaust fan is actually working and moving air? and My bathroom is stinky and humid even though it has an exhaust fan. What can I do to fix it? and What are the ventilation requirements for bathrooms and kitchens in mobile homes?
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