Can a bathroom exhaust fan dump air (discharge/terminate) in the attic?

Saturday, August 4, 2018

Both the International Residential Code (IRC M1501.1) and Residential Edition of the Florida Building Code (FBC) are very specific: the air must be discharged to the outdoors, and vent termination into an attic, ridge vent or crawl space is excluded.

   The most common way we see in our area to correctly terminate a bathroom exhuast fan is to a vent grille in the soffit, as shown in the photo above. Running it up to near the ridge, like in the photo below, might see sensible but it’s a no go. There is a lot of moisture in bathroom exhaust air and it needs to go all the way out. 

For more info about bathroom exhaust fans, see these other blog posts:

Does a half bathroom (no shower or tub) require an exhaust fan?

What are the ventilation requirements for bathrooms and kitchens in mobile homes?

What are the requirements for bathroom ventilation?  

• How can I check to see if my bathroom exhaust fan is actually working and moving air? 

• My bathroom is stinky and humid even though it has an exhaust fan. What can I do to fix it?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • 

  To learn more about heating and air conditioning systems, see these other blog posts:

How can I find out the SEER of my air conditioner? 

My air conditioner won't turn on. What's wrong? 

How can I find out the size of my air conditioner? 

How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump? 

Where is the air filter for my central air conditioner and furnace? I can’t find it? 

Does an old air conditioner use more electricity as it ages? 

How did homes stay cool in Florida before air conditioning? 

What is wrong with an air conditioner when the air flow out of the vents is low?

Why has the thermostat screen gone blank? 

Why does it take so long to cool a house when an air conditioner has been off for a while? 

Why is my air conditioner not cooling enough? 

What are the most common problems with wall/window air conditioners?  

Will closing doors reduce my heating and cooling costs? 

   Visit our HEATING AND AIR CONDITIONING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles. 

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