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) Vent System
Vent Piece | 7" (17.8 cm) Round |
45° elbow | 2.5 ft |
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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) | 5.0 ft |
90° elbow | (1.5 m) |
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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) |
7" (17.8 cm) |
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wall cap |
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3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 4.5 ft |
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to 7" (17.8 cm) |
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| (1.4 m) |
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3¹⁄₄" x 10" (8.3 cm x 25.4 cm) | 5.0 ft |
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to 7" (17.8 cm) 90° elbow |
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| (1.5 m) |
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Example vent system |
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90˚ elbow |
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| Wall cap | |
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| 6 ft (1.8 m) |
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| 2 ft (0.6 m) |
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Maximum Recommended Length | = 50 ft (15.2 m) | |||||||||||||
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1 - 90° elbow |
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1 - wall cap |
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8 ft (2.4 m) straight |
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Length of 7" (17.8 cm) system |
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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) |
system |
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