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Installation
1300003 (EN)
22
Individual Venting
For maximum efficiency and performance, it is
required to exhaust finisher(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 finisher.
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.
NOTE: Static back pressure must be measured
with the finisher running.
The maximum allowable length venting of the same
diameter as the exhaust thimble 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 2 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 Table 8 to
determine equivalent venting.
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 feet + (2) 90° elbows
= 14 feet + 14 feet + 14 feet
= 42 feet (12.8 meters)
With the finisher 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.
Duct Diameter
Equivalent Length of
Straight Duct
4 in. (102 mm)
6 in. (152 mm)
8 in. (203 mm)
10 in. (254 mm)
12 in. (305 mm)
14 in. (356 mm)
16 in. (406 mm)
18 in. (457 mm)
One 90° elbow = 6 ft. (1.8 m)
One 90° elbow = 7 ft. (2.1 m)
One 90° elbow = 9.3 ft. (2.83 m)
One 90° elbow = 11.6 ft. (3.5 m)
One 90° elbow = 14 ft. (4.3 m)
One 90° elbow = 16 ft. (4.9 m)
One 90° elbow = 18.7 ft. (5.7 m)
One 90° elbow = 21 ft. (6.4 m)
Equivalent Length (feet) = 1.17 x Duct Diameter (inches)
Table 8
FWF83N
Figure 11
AIR OUT
NO SCREEN OR CAP
2 in. (51 mm)
MINIMUM CLEARANCE
2 in. (51 mm)
MINIMUM
CLEARANCE
30 in. (762 mm) MINIMUM CLEARANCE
7 in.
(178 mm)
CEILING
2 in. (51 mm) MINIMUM CLEARANCE
31.62 in.
(803 mm)
10 in.
(254 mm)
2 in.
(51 mm)
MINIMUM
CLEARANCE
180°
SWEEP ELBOW
WALL
WHERE THE EXHAUST DUCT PIERCES THE WALL OR CEILING, AN
OPENING HAVING A DIAMETER FOUR INCHES LARGER THAN THE
DIAMETER OF THE EXHAUST DUCT SHALL BE PROVIDED, AND THE
EXHAUST DUCT CENTERED WITHIN THE OPENING.
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