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) Vent System
Vent Piece | 6" (15.2 cm) Round |
45° elbow | 2.5 ft |
| (0.8 m) |
90° elbow | 5.0 ft |
| (1.5 m) |
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) |
|
|
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 5.0 ft |
90° elbow | (1.5 m) |
|
|
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 12.0 ft |
flat elbow | (3.7 m) |
|
|
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 0.0 ft |
wall cap | (0.0 m) |
6" (15.2 cm) | 0.0 ft |
wall cap | (0.0 m) |
|
|
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 4.5 ft |
to 6" (15.2 cm) | (1.4 m) |
|
|
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 5.0 ft |
to 6" (15.2 cm) 90° elbow | (1.5 m) |
Example vent system
3¹⁄₄" x 10" |
|
(8.3 x 25.4 cm) |
|
elbow | Wall cap |
6 ft (1.8 m) |
2ft
(0.6 m)
Example vent system
90˚ elbows
3¼" x 10"
(8.3 x 25.4 cm) to 6" (15.2 cm) transition
6 ft
(1.8 m) 
2 ft (0.6 m)
Wall cap
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 3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | = 13.0 ft (3.9 m) | |
system |
| |
1 | - transition | = 4.5 ft (1.4 m) |
2 | - 90° elbows | = 10.0 ft (3.0 m) |
1 | - wall cap | = 0.0 ft (0.0 m) |
8 ft (2.4 m) straight | = 8.0 ft (2.4 m) | |
|
| |
Length of 6" (15.2 cm) system | = 22.5 ft (6.9 m) | |
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