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6
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
45° elbow 2.5 ft
(0.8 m)
90° elbow 5.0 ft
(1.5 m)
6" (15.2 cm) or larger
wall cap
0.0 ft
(0.0 m)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) or larger
4.5 ft
(1.4 m)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 6" (15.2 cm) or larger
90° elbow
5.0 ft
(1.5 m)
Example vent system
Maximum Recommended Length = 50 ft (15.2 m)
1 - 90° elbow = 5.0 ft (1.5 m)
1 - wall cap = 0.0 ft (0.0 m)
8 ft (2.4 m) straight = 8.0 ft (2.4 m)
Length of 7" (17.8 cm) system = 13.0 ft (3.9 m)
3¼" x 10" (8.3 cm x 25.4 cm) Vent System
Vent Piece
3¼" x 10" (8.3 cm x 25.4 cm)
90° elbow
5.0 ft
(1.5 m)
3¼" x 10" (8.3 cm x 25.4 cm)
flat elbow
12.0 ft
(3.7 m)
3¼" x 10" (8.3 cm x 25.4 cm)
wall cap
0.0 ft
(0.0 m)
Example vent system
Maximum Recommended Length = 35 ft (10.7 m)
1 - 90° elbow = 5.0 ft (1.5 m)
8 ft (2.4 m) straight = 8.0 ft (2.4 m)
1 - wall cap = 0.0 ft (0.0 m)
Length of 3¼" x 10" (8.3 cm x 25.4 cm)
system
= 13.0 ft (3.9 m)
Wall cap
90˚ elbow
2 ft (0.6 m)
6 ft (1.8 m)
Wall cap
3
¹⁄₄" x 10"
(8.3 x 25.4 cm)
elbow
2 ft
(0.6 m)
6 ft (1.8 m)
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