Plumbing codes require bathrooms to
contain an operable window, an
exhaust fan, or both — for good reason.
In an unventilated bathroom, warm,
moisture-laden air can condense on cool
wall and window surfaces, where it supports
bacteria and mildew growth, causes
paint failure, and may even lead to
structural damage from decay, as it penetrates
and condenses in wall cavities.
The problem with the minimum
code requirement is that no one wants
to leave the bathroom window open
year-round, and most exhaust fans are
too noisy. Do your customer a favor by
recommending a bathroom ventilation
strategy that works: a quiet fan
with enough exhaust capacity for the
space, and controls that make it convenient
to use.
Effective Air Change
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