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I am renovating a few rooms including an existing laundry room. It currently has one exterior window and another openable window onto an existing mudroom (which also has exterior windows).

After the renovation, the laundry will lose the exterior window as an existing bathroom is extended. The interior window into the mudroom will survive.

Does the Uniform Building Code require that a room with no exterior windows have an exhaust vent fan? Does the existence of the interior openable window into a room with exterior windows have a bearing on that? (I do realize that local regulations may vary from the Uniform Code, but my jurisdiction generally follows those regs.)

[I know there is a related question here, but I have no air conditioning and I am wondering about the additional interior window.]

  • I'm not sure what the benefit of an exhaust fan in a laundry room would be. Arguably, if it's a gas dryer, an exhaust fan would actually be a bad idea. Interior bathrooms need fans, but that's usually about moisture (or smells). – DA01 Feb 3 '15 at 3:02
  • It is a gas dryer and there is an open doorway into a hall for airflow. Not advocating, just asking about the rules. – bib Feb 3 '15 at 3:09
  • I do not know about the rules, so would have to defer to others. Typically, though, you don't want something competing for air in a room with a combustion appliance unless said vent is the exhaust for the appliance (such as a kitchen hood vent) – DA01 Feb 3 '15 at 3:11
  • @DA01: I think even if the fan is the exhaust for the equipment, like a hood, if the fan is large enough you have to provide make-up air that is controlled by the fan switch. So that's in addition to any central air vents. – ChiefTwoPencils Feb 3 '15 at 4:55
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No, this is not a code requirement for laundry rooms in dwelling units (at least in the 2012 IBC).

In fact, most dryers are essentially acting as exhaust fans when they run because they take air from the room and exhaust it outside.

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Whilst you're specifically asking about the Uniform Building Control, I'll add this as this answers the question for people wanting to know the answer that would be compliant with UK building regulations:

In the UK, utility rooms in newly built homes require either a continuous airflow of 8 litres per second, or a switchable (intermittent) fan capable of at least 30 litres per second. A window alone may not be sufficient to provide this sort of airflow.

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Washington State requires a minimum 50 CFM exhaust fan in the laundry room.

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    Hello, Robert, and welcome to Home Improvement. I edited out your contact info; it's best to put that in your profile. But, with your knowledge and experience, I'm looking forward to more contributions from you. Thanks! – Daniel Griscom Sep 17 '18 at 19:08
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    Can you provide a specific citation for this requirement? (It is a curious one, let me put it that way, and the citation to Washington state building code would make this a stronger answer.) – ThreePhaseEel Sep 17 '18 at 23:30
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As far as I know no active fan is required by code in laundry rooms. Most laundries vent the dryer outdoors which is sufficient to dissipate humidity from the room. Washers generate very little ambient moisture.

However if you intend to vent the dryer indoors then you certainly will need some form of added ventilation to distribute the moisture across a much larger space, probably using a powered fan. Dryers produce even more humidity than do bathrooms, so careful venting is essential.

  • I don't believe code would allow you to vent the dryer indoors in the first place--with our without a vent fan. – DA01 Feb 3 '15 at 5:11
  • It seems you're right, though some code seems to allow for a special kind of interior dryer vent that condenses the moisture into a special container. homeguides.sfgate.com/… – Randy Feb 3 '15 at 5:23
  • And with a gas dryer, those fumes contain more that just moisture...they need to go outside. – Grant Feb 3 '15 at 5:26
  • In my case, there is already an exterior vent for the gas dryer that will remain. – bib Feb 3 '15 at 12:03
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    @Randy, That's a special kind of dryer (a condensing dryer), not a special kind of vent. – littleturtle Feb 3 '15 at 15:52
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Exhaust fans in laundry rooms are usually required when there is no exterior window in the room and the dryer to be used heats with gas power. Why? To exhaust the carbon monoxide (CO).

CO in large amounts is hazardous to humans and can cause asphyxiation/death.

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