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.
Exhaust Requirements
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.
T438I
Figure 10
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