WORKSHEET—CALCULATE TOTAL EQUIVALENT DUCTWORK LENGTH
DUCT | EQUIVALENT NUMBER |
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PIECES | LENGTH | x USED | = | TOTAL | ||
31⁄4″ x 10″ | 1 Ft. | x | ( | ) | = | Ft. |
Rect., |
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straight |
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7″ Round, | 1 Ft. | x | ( | ) | = | Ft. |
straight |
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6″ Round, | 1 Ft. | x | ( | ) | = | Ft. |
straight |
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31⁄4″ x 10″ | 14 Ft. | x | ( | ) | = | Ft. |
Rect. 90° |
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elbow |
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31⁄4″ x 10″ | 8 Ft. | x | ( | ) | = | Ft. |
Rect. 45° |
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elbow |
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31⁄4″ x 10″ | 33 Ft. | x | ( | ) | = | Ft. |
Rect. 90° |
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flat elbow |
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31⁄4″ x 10″ | 24 Ft. | x | ( | ) | = | Ft. |
Rect. | (18 ft. w/o |
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wall cap | damper) | x | ( | ) | = | Ft. |
with |
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damper |
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31⁄4″ x 10″ | 2 Ft. | x | ( | ) | = | Ft. |
Rect. to |
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6″ round |
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transition |
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31⁄4″ x 10″ | 4 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, | 25 Ft. | x | ( | ) | = | Ft. |
90° elbow |
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6″ Round, | 16 Ft. | x | ( | ) | = | Ft. |
45° elbow |
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| Subtotal column 1 |
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MAXIMUM DUCT LENGTH: For satisfactory air movement, the total duct length of a 31⁄ 4″ x 10″ rectangular, 7″ diameter round duct should not exceed 65 equivalent feet.
DUCT | EQUIVALENT |
| NUMBER |
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PIECES | LENGTH | x USED | = | TOTAL | ||
6″ Round | 53 Ft. | x | ( | ) | = | Ft. |
wall cap | (39 ft. w/o |
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with | damper) | x | ( | ) | = | Ft. |
damper |
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6″ Round | 72 Ft. | x | ( | ) | = | Ft. |
roof cap |
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6″ Round | 3 Ft. | x | ( | ) | = | Ft. |
to |
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31⁄4″ x 10″ |
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rect. |
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transition |
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6″ Round | 9 Ft. | x | ( | ) | = | Ft. |
to |
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31⁄4″ x 10″ |
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rect. |
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transition |
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90° elbow |
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7″ Round, | 14 Ft. | x | ( | ) | = | Ft. |
90° elbow |
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7″ Round, | 9 Ft. | x | ( | ) | = | Ft. |
45° elbow |
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7″ Round | 28 Ft. | x | ( | ) | = | Ft. |
wall cap | (21 ft. w/o |
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with | damper) | x | ( | ) | = | Ft. |
damper |
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7″ Round | 39 Ft. | x | ( | ) | = | Ft. |
roof cap |
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7″ Round | 1 Ft. | x | ( | ) | = | Ft. |
to |
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31⁄4″ x 10″ |
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rect. |
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transition |
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7″ Round | 5 Ft. | x | ( | ) | = | Ft. |
to |
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31⁄4″ 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 |
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| Subtotal column 1 |
| = | Ft. | ||
| Total ductwork | = | Ft. |
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