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.
7" (17.8 cm) Round Vent System
Vent Piece | Round |
45° elbow | 2.5 ft |
| (0.8 m) |
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90° elbow | 5.0 ft |
| (1.5 m) |
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7" (17.8 cm) wall cap | 0.0 ft |
| (0.0 m) |
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3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 4.5 ft |
to 7" (17.8 cm) | (1.4 m) |
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3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 5.0 ft |
to 7" (17.8 cm) 90° elbow | (1.5 m) |
Example vent system
7" (17.8 cm) round |
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90˚ elbow |
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| 6 ft (1.8 m) |
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2 ft (0.6 m)
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) | |
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Length of 7" (17.8 cm) system | = 13.0 ft (3.9 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) | 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) |
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3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 0.0 ft | |||
wall cap | (0.0 m) | |||
Example vent system
3¹⁄₄" x 10" |
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(8.3 x 25.4 cm) |
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elbow | Wall cap |
6 ft (1.8 m) |
2ft
(0.6 m)
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) |
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Length of 3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | = 13.0 ft (3.9 m) |
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