Individual Venting

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

IMPORTANT: At no point may the cross sectional area of installed venting be less than the cross sectional area of the exhaust outlet of the tumble dryer.

The exhaust duct 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 the tumble dryer.

NOTE: Static back pressure must be measured with the tumble dryer running.

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 4 to determine equivalent venting:

	Duct Diameter	Equivalent Length
	Duct Diameter	of Rigid Straight Duct
		of Rigid 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 4

Example: A 12 inch (305 mm) diameter duct’s equivalent length of 14 feet (4.3 meters) of duct and two 90° elbows is:

Equivalent Length: = 14 ft. (4.3 m) + (2) 90° elbows

=14 ft. (4.3 m) + 14 ft. (4.3 m)

+14 ft. (4.3 m)

=42 ft. (12.8 m)

With the tumble dryer 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 (366 meters per minute) cannot be maintained, schedule monthly inspections and cleaning of the ductwork.

Exhaust Requirements

NOTE: The maximum length of a flexible metal duct must not exceed 7.87 ft. (2.4 m) as required to meet UL2158, claus 7.3.2A.

Manifold Venting

While it is preferable to exhaust tumble dryers individually to the outdoors, a main collector duct may be used if it is sized according to Figure 8. 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 6. Individual tumble dryer ducts must enter manifold duct at a 45° angle in the direction if airflow.

NOTE: Never connect a tumble dryer duct at a 90° angle to a collector duct. Refer to Figure 6. Doing so will cause excessive back pressure, resulting in poor performance. Never connect two tumble dryer exhaust ducts directly across from each other at the point of entry to manifold duct.

T438I

Figure 6

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 tumble dryer. This must be measured with all tumble dryers running that are vented into collector.

70420801 (EN)

907003062 specifications

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