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Calculating
Vent System Length
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the system.
6" (15.2 cm) or Larger Round Vent System
Vent Piece
Round
31/4'' x 10" (8.3 cm x 25.4 cm) Vent System
Vent Piece
31/4"x 10" (8.3 cm x 25.4 cm)
5.0 ft
90 ° elbow
(1.5 m)
45 ° elbow
2.5 ft
(0.8 m)
31/4"x 10" (8.3 cm x 25.4 cm)
12.0 ft
flat elbow
(3.7 m)
90 ° elbow
5.0 ft
(1.5 m)
31/4"x 10" (8.3 cm x 25.4 cm)
0.0 ft
wall cap
(0.0 m)
6" (15.2 cm) or larger
0.0 ft
wall cap
(0.0 m)
3%" x 10" (8.3 cm x 25.4 cm)
4.5 ft
to 6" (15.2 cm) or larger
(1.4 m)
3%" x 10" (8.3 cm x 25.4 cm)
5.0 ft
to 6" (15.2 cm) or larger
(1.5 m)
90 ° elbow
Example vent system
90o elbow
........._.,m_l
Wall cap
_--
6 ft (1.8 m)
Maximum Recommended
Length
= 50 ft (15.2 m)
1 - 90 ° elbow
1 - wall cap
8 ft (2.4 m) straight
Length of 7" (17.8 cm) system
= 5.0 ft (1.5 m)
= 0.0 ft (0.0 m)
= 8.0 ft (2.4 m)
= 13.0 ft (3.9 m)
Example vent system
31/4" xlO"
(8.3 x 25.4 cm)
eNbow
6 ft (1.8 Ill)
/
Maximum Recommended
Length
Wall cap
= 35 ft (10.7 m)
1 - 90 ° elbow
8 ft (2.4 m) straight
1 - wall cap
Length of 31/4 '' x 10" (8.3 cm x 25.4 cm)
system
= 5.0 ft (1.5 m)
= 8.0 ft (2.4 m)
= 0.0 ft (0.0 m)
= 13.0 ft (3.9 m)
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