IPSO TMB1268C Manuel D’Utilisation

Tumblers – 120 and 170

3-09-71

Manifold Venting

While it is preferable to exhaust tumblers individually

to the outdoors, a main collector duct may be used if it

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

and Table 4 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