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Duct pieces | Equivalent number |
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| lenght x used | = | Total | |
3 1/4 ” x 10” | 1 Ft. | x ( | ) = | Ft. |
Rect., |
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straight |
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6 ” Round,, | 1 Ft. | x ( | ) = | Ft. |
straight |
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7", 8” | 1 Ft. | x ( | ) = | Ft. |
Round,, |
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straight |
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3 1/4 ” x 10” | 15 Ft. | x ( | ) = | Ft. |
Rect.90° |
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elbow |
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3 1/4 ” x 10” | 9 Ft. | x ( | ) = | Ft. |
Rect.45° |
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elbow |
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3 1/4 ” x 10” | 24 Ft. | x ( | ) = | Ft. |
Rect.90° |
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flat elbow |
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3 1/4 ” x 10” | 30 Ft. | x ( | ) = | Ft. |
Rect. |
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wall cap |
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with damper |
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3 1/4 ” x 10” | 5 Ft. | x ( | ) = | Ft. |
Rect.to |
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6 ” round |
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transition |
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3 1/4 ” x 10” | 15 Ft. | x ( | ) = | Ft. |
Rect.to |
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6 ” round |
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transition |
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90° elbow |
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6 ” Round,, | 15 Ft. | x ( | ) = | Ft. |
90° elbow |
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6 ” Round,, | 9 Ft. | x ( | ) = | Ft. |
45°elbow |
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| Subtotal column 1 | = | ||
Maximum Duct Length: For satisfactory air movement, the total duct length should not exceed 100 equivalent feet.
Duct pieces | Equivalent number |
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| lenght x used | = | Total | ||
6" Round | 30 Ft. | x ( | ) = | Ft. | |
wall cap |
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with damper |
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6” Round, | 30 Ft. | x ( | ) = | Ft. | |
roof cap |
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6” Round to | 1 Ft. | x ( | ) = | Ft. | |
3 1/4 ” x 10” |
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rect. |
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transition |
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6” Round to | 16 Ft. | x ( | ) = | Ft. | |
3 1/4 ” x 10” |
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rect. |
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transition |
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90° elbow |
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7", 8" round | 15 Ft. | x ( | ) = | Ft. | |
90° elbow |
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7", 8" round | 9 Ft. | x ( | ) = | Ft. | |
45° elbow |
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7", 8" Round | 30 Ft. | x ( | ) = | Ft. | |
wall cap |
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with damper |
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7", 8" | 30 Ft. | x ( | ) = | Ft. | |
Round, |
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roof cap |
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7” Round to | 8 Ft. | x ( | ) = | Ft. | |
3 1/4 ” x 10” | |||||
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rect. |
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transition |
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6” Round to | 15 Ft. | x ( | ) = | Ft. | |
3 1/4 ” x 10” | |||||
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rect. |
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transition |
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90° elbow |
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| Subtotal column 2 | = | |||
| Subtotal column 2 | = | |||
| Total ductwork |
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Installation - Ductwork Calculation Sheet
9
