Alliance Laundry Systems Stacked Drying Tumbler - Manual (Page 14)

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Installation Instructions
M412060 12
Individual Venting
For maximum efficiency and performance, it is
preferred to exhaust tumbler(s) individually to the
outdoors. Refer to Figure 1 and 2. AT NO POINT
MAY THE CROSS AREA OF INSTALLED
VENTING BE LESS THAN THE CROSS AREA
OF THE EXHAUST THIMBLE OF THE
TUMBLER.
THE MAXIMUM ALLOWABLE LENGTH OF
VENTING IS 14 FEET (4.3 M) AND TWO 90°
ELBOWS, OR EQUIVALENT. The table below
shows how to determine equivalent length of venting
for 90° elbows:
If the equivalent length of a duct required for an
installation exceeds the maximum allowable
equivalent length, the diameter of a round duct must be
increased by 10 percent for each additional 20 feet.
The cross area of a rectangular duct must be increased
20% for each additional 20 feet (6.1 m).
With the tumbler in operation, airflow at any point in
the duct must be at least 1200 feet (366 m) per minute
to ensure that the lint remains airborne.
Combined Exhaust Manifold Venting
The upper and lower units may be exhausted into a
combined exhaust manifold, refer to Figure 2. Refer to
Figure 3 for proper manifold duct construction. THE
MAXIMUM LENGTH OF 10 INCHES (25.4 cm)
DIAMETER EXHAUST DUCT BEYOND THE
MANIFOLD DUCT IS 14 FEET (4.3 m) AND
TWO 90° ELBOWS, OR EQUIVALENT.
Collector 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 4. These illustrations
indicate minimum diameters, and should be increased
if the collector length exceeds 20 feet (6.1 m). The
collector duct may be rectangular in cross section, as
long as the area is not reduced. Provisions should be
made for lint removal and cleaning of the collector
duct.
The collector duct must be tapered, as shown in
Figures 4 and 5. The individual tumbler ducts must
enter the collector duct at a 45° angle in the direction
of airflow. Never connect a tumbler duct at a 90° angle
to the collector duct. 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.
The collector system must be designed so the static
back pressure measured 12 inches (30.48 cm) from the
exhaust thimble does not exceed the maximum
allowable pressure specified on the installation sticker
on the rear of the tumbler. This must be measured with
all tumblers running that are vented into the collector.
DUCT DIAMETER
EQUIVALENT LENGTH OF
STRAIGHT DUCT
6 in (15.3 cm) One 90° elbow = 7 ft (2.1 m)
8 in (20.3 cm) One 90° elbow = 9.3 ft (2.8 m)
10 in (25.4 cm) One 90° elbow = 11.6 ft (3.5 m)
12 in (30.5 cm) One 90° elbow = 14 ft (4.3 m)
FORMULA: Equivalent Length (feet or meters) =
1.17 x Duct Diameter (inches or centimeters)
EXAMPLE: A 6 inch diameter duct’s equivalent
length of 14 feet of vent and two 90° elbows is:
Equivalent
Length: = 14 ft (4.3 m) + (2) 90° elbows
= 14 ft + 7 ft + 7 ft (4.3 m + 2.1 m + 2.1 m)
= 28' (8.5 m)