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Tumblers – 50 and 75
4-08-44
15
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 4
and
Figure 5
. This
illustration indicates minimum diameters, which
should be increased if the collector length exceeds 14
feet (4.3 meters) and two 90° elbows. The diameter of
a round duct must be increased by 10% for each
additional 20 feet (6.1 meters). Cross sectional area of
a rectangular or square duct must be increased 20% for
each additional 20 feet (6.1 meters). Refer to
Table 2
and
Table 3
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 3
. 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, airflow at any point in
the duct should be at least 1200 feet per minute (366
meters per minute) to ensure that lint remains airborne.
If 1200 feet per minute cannot be maintained, schedule
monthly inspections and cleaning of the ductwork.
Figure 3
T438I
