Alliance Laundry Systems T433I Individual Venting, Manifold Venting, Duct Diameter, of Straight Duct, =42 ft. (12.8 m), Equivalent Length, Exhaust Requirements, =14 ft. + 14 ft. + 14 ft

Individual Venting

For maximum efficiency and performance, it is preferred to exhaust tumbler(s) individually to the outdoors.

IMPORTANT: 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 of the same diameter as the exhaust thimble is 14 feet (4.3 meters) and two 90° elbows or equivalent. 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% for each additional 20 feet (6.1 meters). Cross section area of a rectangular duct must be increased by 20% for each additional 20 feet (6.1 meters). Refer to Table 5 to determine equivalent venting:

	Duct Diameter	Equivalent Length
	Duct Diameter	of Straight Duct
		of Straight Duct

10 in. (254 mm) One 90° elbow = 11.6 ft. (3.5 m) 12 in. (305 mm) One 90° elbow = 14 ft. (4.3 m) 14 in. (356 mm) One 90° elbow = 16 ft. (4.9 m) 16 in. (406 mm) One 90° elbow = 18.7 ft. (5.7 m) 18 in. (457 mm) One 90° elbow = 21 ft. (6.4 m)

Equivalent Length (ft.) = 1.17 x Duct Diameter (in.)

Table 5

Example: A 12 inch diameter duct’s equivalent length of 14 feet of duct and two 90° elbows is:

Equivalent Length: = 14 ft. + (2) 90° elbows=14 ft. + 14 ft. + 14 ft.=42 ft. (12.8 m)

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 a regular inspection and cleaning of the ductwork.

Exhaust Requirements

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 10. This illustration indicates minimum diameters, and should be increased if collector length exceeds 20 feet (6.1 meters). Manifold duct may be rectangular in cross section, as long as area is not reduced. Provisions should be made for lint removal and cleaning of duct.

Manifold duct must be tapered, as shown in Figure 9. Individual tumbler ducts must enter manifold duct at a 45° angle in the direction if airflow.

Never connect a tumbler duct at a 90° angle to a 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 manifold duct.

T438I

Figure 9

Exhaust system must be designed so static back pressure measured 12 inches (305 mm) from exhaust thimble does not exceed maximum allowable pressure specified on installation sticker on rear of tumbler. This must be measured with all tumblers running that are vented into collector.

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 a regular inspection and cleaning of the ductwork.

M414038