Burnt Eddy Wrote:
Depending on how observent your building inspector is... a dryer vent
has a
length limit of 14' (horizontal and vertical) and two 90 degree elbows.
You
have to deduct 2' of length for every additional elbow (per the
Building
Code, ICC). If it is longer, your appliance dealer may be able to help
with
a booster fan or something else....

ICC International Residential Code for 2003 states:

"M1501.3 Length Limitation. The maximum length of a clothes dryer
exhaust duct shall not exceed 25 feet from the dryer location to the
wall or roof termination. The maximum length of the duct shall be
reduced 2.5 feet for each 45-degree bend and 5 feet for each 90-degree
bend. The maximum length of the exhaust duct does not include the
transition duct."

Exceptions are the use of a mechanical booster or a dryer that can be
shown by the manufacturer to be able exceed the 25 foot limits.

A roof vent should be the very last choice for venting a dryer and the
vent would best be run to a sidewall via a soffit, or thru a basement
or crawlspace.


--
manhattan42
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