Alliance Laundry Systems Drying Cabinet - Manual (Page 29)

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Exhaust Requirements
27 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. 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 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