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8514-311-001 REV PR
Maintain a minimum of 25 mm (1 inch) clearance between duct and combustible material.
If the exhaust pipe passes through a wall, a metal sleeve of slightly larger diameter should be
set in the wall and the exhaust pipe passed through this sleeve. This practice is required by
some local codes and is recommended in all cases to protect the wall.
This type of installation should have a means provided to prevent rain and high winds from
entering the exhaust when the dryer is not in use. A hood with a hinged damper can be used
for this purpose. Another method would be to point the outlet end of the pipe downward to
prevent entrance of wind and rain. In either case, the outlet should be kept clear, by at least
610 mm (24 inches) of any objects, which would cause air restriction.
Never install a protective screen over the exhaust outlet.
When exhausting a dryer straight up through a roof, the overall length of the duct has the same
limits as exhausting through a wall. A rain cap must be placed on top of the exhaust and must
be of such a type as to be free from clogging. The type using a cone shaped “roof” over the
pipe is suitable for this application.
Do not use an unlined masonry chimney as the flue for this appliance. Exhausting the dryer into
a chimney or under a building is not permitted. In either case there is a danger of lint buildup,
which can be highly combustible.
Installation of several dryers, where a main discharge duct is necessary, will need the following
considerations for installation, see figure below. Individual 200 mm (8 inch) exhaust ducts
from each dryer should enter main discharge duct at a 45-degree angle in the direction of
discharge airflow.
Never install the individual ducts at a right angle into the main discharge duct. The individual
ducts from the dryers can enter at the sides or bottom of the main discharge duct. Figure below
indicates the various round main duct diameters to use with the individual dryer ducts. The
main duct can be rectangular or round, provided adequate airflow is maintained. The total
exhausting, main discharge duct plus duct outlet from the dryer, should not exceed the
equivalent of 4.25 m (14 feet) and two elbows. The diameter of the main discharge duct at the
last dryer must be maintained to exhaust end.
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