Individual Venting
For maximum efficiency and performance, it is preferred to ex-
haust 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 in the Specifi-
cations and Dimensions Table or 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 venting is 14 feet [4.3 m] 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 m]. Cross section area of
a rectangular duct must be increased by 20% for each additional
20 feet [6.1 m]. Refer to
to determine equivalent venting.
Duct Diameter
Equivalent Length of
Rigid Straight Duct
8 in. [203 mm]
One 90° elbow = 9.3 ft. [2.8
m]
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 (meter) = 1.17 x Duct Diameter (mm)
Table 3
Example: A 12 inch [305 mm] diameter duct’s equivalent length
of 14 feet [4.3 m] 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/min. [366 m/min.] to ensure that
lint remains airborne. If 1200 feet/min. [366 m/min.] cannot be
maintained, schedule monthly inspections and cleaning of the
ductwork.
NOTE: The maximum length of a flexible metal duct
must not exceed 7.9 ft. [2.4 m] as required to meet
UL2158, clause 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 accord-
ing to
and
. This illustration indicates mini-
mum 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
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 in the
Specifications and Dimensions Table or on the installation sticker
on the rear of tumble dryer. Static back pressure must be meas-
ured with all tumble dryers vented into the collector operating.
NOTE: Never connect a tumble dryer duct at a 90° an-
gle to the collector duct. Refer to
. 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 the collector duct.
With the tumble dryer in operation, airflow at any point in the
duct should be at least 1200 feet/min. [366 m/min.] to ensure that
lint remains airborne. If 1200 feet/min. [366 m/min.] cannot be
maintained, schedule monthly inspections and cleaning of the
ductwork.
T438i_SVG
Figure 19
Exhaust Requirements
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39
Part No: 70457901ENR15
Содержание 0904004427
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