Bathroom Exhaust Fan
A ceiling-mounted ducted fan that removes moisture and odors from a bathroom; code requires venting to outdoors, not the attic.
Quick answer
Bathroom Exhaust Fan: A ceiling-mounted ducted fan that removes moisture and odors from a bathroom; code requires venting to outdoors, not the attic. Typical cost: $120–$400 hardware; $300–$800 installed..
Why it matters
Improperly vented bath fans dump moisture into attics, causing mold and rotted decking — a $4 mistake that triggers $4,000 in damage.
Typical cost
$120–$400 hardware; $300–$800 installed.
Pros
- • Prevents mold and peeling paint
- • Modern fans are nearly silent (≤1.0 sone)
Cons
- • Must terminate outside, not in attic
- • Filters need annual cleaning
Common uses
- • Every bathroom without an operable window
Alternatives
Operable window (in mild climates only)
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Frequently asked questions
- How big a fan do I need?
- 1 CFM per sq ft of bathroom; minimum 80 CFM for any bath with a shower.
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