Dexter Laundry T-30X2 EXPRESS - Electric (On-Premise) - Manual (Page 7)

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tend to collect lint, which will eventually clog the duct and prevent the dryer from exhausting
properly. All elbows must be smooth on the inside. All joints must be made so the exhaust end
of one pipe is inside the next one downstream. The addition of an exhaust pipe tends to reduce
the amount of air the blower can exhaust. This does not affect the dryer operation if held within
practical limits. For the most efficient operation, it is recommended that no more than 14 ft.
(4.25 m) of straight 8 in. (204 mm) diameter pipe is used with two right angle elbows. When
more than two elbows are used, 2 ft. (610 mm) of straight pipe should be removed for each
additional elbow. No more than four right angle elbows should be used to exhaust a dryer.
Maintain a minimum of 1” (25mm) 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 24 in. (610 mm), of any objects, which would
cause air restriction.
Provide a screen or grill over the termination of the exhaust or flue outlet such as will prevent
the entry of a ball of 16 mm in diameter while the machine is not operating but will allow entry
of a ball 6 mm in diameter while operating.
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.
Exhausting the dryer into a chimney or under a building is not permitted. The exhaust air
should not be vented into a wall, a ceiling, or a concealed space of building. In these cases, there
is a danger of lint buildup, which can be highly combustible.