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Determine Vent Length
1. Select the route that will provide the straightest and most
direct path outdoors. Plan the installation to use the fewest
number of elbows and turns. When using elbows or making
turns, allow as much room as possible. Bend vent gradually to
avoid kinking. Avoid 90º turns.
2. Determine vent length.
The maximum length of the exhaust system depends upon:
The type of vent (rigid metal or flexible metal).
The number of elbows used.
If a combination of rigid and flexible metal vent is used.
Recommended hood styles are shown here.
1
1. Louvered hood style
2. Box hood style
The angled hood style (shown following) is acceptable.
4"
(10.2 cm)
The same length of vent can be used with any of the 3 exhaust
hoods shown.
Exhaust systems longer than specified will:
Shorten the life of the dryer.
Reduce performance, resulting in longer drying times and
increased energy usage.
3. Determine the number of elbows you will need.
NOTE: Do not use vent runs longer than specified in the Vent
Length Chart.
When using only one type of metal vent:
Use the following chart to help you determine your maximum
vent length based on the number of 90° turns or elbows you
will need and the type of vent (rigid and/or flexible metal) you
will use.
2
4"
(10.2 cm)
4"
(10.2 cm)
2½"
(6.4 cm)
Vent Length Chart
Number of 90º
Rigid metal vent
turns or elbows
0
120 ft (36.6 m)
1
110 ft (33.5 m)
2
100 ft (30.5 m)
3
90 ft (27.4 m)
4
80 ft (24.4 m)
5
70 ft (21.3 m)
When using a combination of rigid and flexible metal vent:
Use the following charts to help you determine your maximum
vent length based on the number of 90° turns or elbows you
will need.
Determine the number of elbows or turns you will need.
Determine the length of the fully extended flexible metal
vent you will use. Find the column that has the nearest
number of feet to what you will be using.
Match the number of turns or elbows with the length of the
fully extended flexible metal vent you will use to find the
maximum length of rigid metal vent you can use.
Vent Length Chart - 0 ft (0 m) to 10 ft (3.0 m)
No. of
Length of Flexible Metal Vent
turns or
elbows
0 ft
1-5 ft
(0 m)
(.3-1.5 m)
0
120 ft
105 ft
(36.6 m)
(32.0 m)
1
110 ft
95 ft
(33.5 m)
(29.0 m)
2
100 ft
85 ft
(30.5 m)
(25.9 m)
3
90 ft
75 ft
(27.4 m)
(22.9 m)
4
80 ft
65 ft
(24.4 m)
(19.8 m)
5
70 ft
55 ft
(21.3 m)
(16.8 m)
Flexible metal vent
40 ft (12.2 m)
37 ft (11.3 m)
33 ft (10.1 m)
30 ft (9.1 m)
27 ft (8.2 m)
23 ft (7.0 m)
6-10 ft
(1.8-3.0 m)
90 ft
(27.4 m)
80 ft
(24.4 m)
Length
of
70 ft
Rigid
(21.3 m)
metal
vent
60 ft
(18.3 m)
50 ft
(15.2 m)
40 ft
(12.2 m)
7
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