Dexter Laundry T-30 Manuel De L'utilisateur page 22

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.
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.
For T-30/50/80 only: Installation of several dryers, where a main discharge duct is necessary, will need
the following considerations for installation (see Figure 3). Individual 8" (200 mm) exhaust ducts from
each dryer should enter main discharge duct at a 45-degree angle in the direction of discharge airflow.
NOTE: 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 3 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 14 ft. (4.25 m) and two elbows. The diameter of the
main discharge duct at the last dryer must be maintained to exhaust end.
NOTE: A small diameter duct will restrict airflow; a large diameter duct will reduce air
velocity - both contributing to lint build up. An inspection door should be provided for
periodic clean out of the main duct.
NOTE: STATIC BACK PRESSURE should be a maximum of 0.3 in. w.c. (7.6 mm w.c.) at the rear
exhaust outlet of the dryer. If multiple dryers are connected to the common duct, ensure the back
draft damper is installed properly.
8514-234-001 REV N page 22
(For T-30/50/80 only)