Table of Contents
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Recommended
Vent Length
A 31/4 '' x 10" (8.3 x 25.4 cm) rectangular or 6" (15.2 cm) round vent
should be used.
The total length of the vent system including straight vent,
elbow(s), transitions and wall or roof caps must not exceed the
equivalent of 140 ft (42.7 m) for either type of vent. See
"Recommended
Standard Fittings" section for equivalent lengths.
For best performance, use no more than three 90 ° elbows.
To calculate the length of the system you need, add the equivalent
lengths of each vent piece used in the system. See the following
examples:
31/4 ' ' x 10" (8.3 x 25.4 cm) vent system = 73 ft (22.2 m) total
A
(0.6m)
6 ft (1.8m)
C
B
,F
A. One 3¼" x 10" (8.3 x 25.4 cm) 90 ° elbow = 25 ft (7.6 m)
B. 1 wall cap = 40 ft (12.2 m)
C. 2 ft (0.6 m) + 6 ft (1.8 m) straight = 8 ft (2.4 m)
6" (15.2 cm) vent system = 73 ft (22.2 m) total
A
B
!i
6 ft (1.8m)
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