Building Codes and Inspections/vent fan

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Expert: - 7/7/2011


Question
does my vent fan in the bathroom have to run from the outside?

Answer
TD:

Yes (I assume you mean "to the outside").

Furthermore, many jurisdictions require round metal as opposed to flex (and certainly none of the  white plastic flex I call "Dryer Hose").

If you intend the fan to work effectively, install duct one size larger than the fan outlet.

I always oversize the Master Bath fan, to draw air through the Master Bedroom at night when it's cool outside with a Master Bedroom window partially open. Cool face, warm body...great sleeping!

Fred

Building Codes and Inspections

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Fred Weldin

Expertise

All aspects of International Mechanical Code, International Energy Conservation Code and International Fuel Gas Code.

Experience

I now troubleshoot existing H&AC installations and design H&AC systems and oversee their installations. I have 23 years experience as a H&AC contractor, and I've worked with the tools as a plumber-pipefitter. I'm certified by ICC as a Commercial Mechanical Inspector.

Organizations
ASHRAE, ICC, NSPE.

Education/Credentials
B of ME, numerous factory schools (York, Honeywell, etc.) and Code seminars.

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