Manifold venting – Alliance Laundry Systems T477C User Manual

Page 29

Exhaust Requirements

70304601

Manifold Venting

While it is preferable to exhaust tumblers individually
to the outdoors, a main collector duct may be used if it
is sized according to Figure 11 or Figure 12. This
illustration indicates minimum diameters, and should
be increased if the collector length exceeds 14 feet (4.3
m) and two 90° elbows. The diameter of a round duct
must be increased by 10% for each additional 20 feet
(6.1 m). Cross sectional area of a rectangular or square
duct must be increased 20% for each additional 20 feet
(6.1 m). Refer to Table 5 or Table 6 to determine
equivalent ducting sizing. The collector duct may be
rectangular or square in cross section, as long as the
area is not reduced. Provisions MUST be made for lint
removal and cleaning of the collector duct.

The vent collector system must be designed so the
static back pressure measured 12 inches (305 mm)
from the exhaust outlet does not exceed the maximum
allowable pressure specified on the installation sticker
on the rear of tumbler. Static back pressure must be
measured with all tumblers vented into the collector
operating.

NOTE: Never connect a tumbler duct at a 90° angle
to the collector duct. Refer to Figure 10. Doing so
will cause excessive back pressure, resulting in poor
performance. Never connect two tumbler exhaust
ducts directly across from each other at the point of
entry to the collector duct.

With the tumbler in operation, and both pockets
running, airflow at any point in the duct should be at
least 1200 feet per minute (366 meters per meter) to
ensure that lint remains airborne. If 1200 feet per
minute cannot be maintained, schedule monthly
inspections and cleaning of the ductwork.

Figure 10

T438I

T438i