www.zephyronline.com
Ins ta lla tion - Ductwork C a lcula tion S heet
Duct pieces | Equivalent number | Total | |||
| length x used |
| = | ||
3 1/4” x 10” | 1 Ft. | x ( | ) | = | Ft. |
Rect., |
|
|
|
|
|
straight |
|
|
|
|
|
7” Round, | 1 Ft. | x ( | ) | = | Ft. |
straight |
|
|
|
|
|
7” Round, | 1 Ft. | x ( | ) | = | Ft. |
straight |
|
|
|
|
|
3 1/4” x 10” | 15 Ft. | x ( | ) | = | Ft. |
Rect. 90 0 |
|
|
|
|
|
elbow |
|
|
|
|
|
3 1/4” x 10” | 9 Ft. | x ( | ) | = | Ft. |
Rect. 45 0 |
|
|
|
|
|
elbow |
|
|
|
|
|
3 1/ 4” x 10” | 24 Ft. | x ( | ) | = | Ft. |
Rect. 90 0 |
|
|
|
|
|
flat elbow |
|
|
|
|
|
3 1/4” x 10” | 30 Ft. | x ( | ) | = | Ft. |
Rect. |
|
|
|
|
|
wall cap |
|
|
|
|
|
with damper |
|
|
|
|
|
3 1/4” x 10” | 5 Ft. | x ( | ) | = | Ft. |
Rect. to |
|
|
|
|
|
6” round |
|
|
|
|
|
transition |
|
|
|
|
|
3 1/ 4” x 10” | 15 Ft. | x ( | ) | = | Ft. |
Rect. to |
|
|
|
|
|
6” round |
|
|
|
|
|
transition |
|
|
|
|
|
90 0 elbow |
|
|
|
|
|
6” Round, | 15 Ft. | x ( | ) | = | Ft. |
90 0 elbow |
|
|
|
|
|
6” Round, | 9 Ft. | x ( | ) | = | Ft. |
45 0 elbow |
|
|
|
|
|
| Subtotal column 1 = | Ft. | |||
Maximum Duct Length: For satisfactory air movement, the total duct length of a 3 1/4” x 10” rectangular, 6” or 7” or 8” diameter round duct should not exceed 100 equivalent feet.
Duct pieces | Equivalent number | Total | |||
| length x used |
| = | ||
6” Round | 30 Ft. | x ( | ) | = | Ft. |
wall cap |
|
|
|
|
|
with damper |
|
|
|
|
|
6” Round, | 30 Ft. | x ( | ) | = | Ft. |
roof cap |
|
|
|
|
|
6” round to | 1 Ft. | x ( | ) | = | Ft. |
3 1/4” x 10” |
|
|
|
|
|
rect. |
|
|
|
|
|
transition |
|
|
|
|
|
6” round to | 16 Ft. | x ( | ) | = | Ft. |
3 1/4” x 10” |
|
|
|
|
|
rect. |
|
|
|
|
|
transition |
|
|
|
|
|
90 0 elbow |
|
|
|
|
|
7” Round, | 15 Ft. | x ( | ) | = | Ft. |
900 elbow |
|
|
|
|
|
7” Round, | 9 Ft. | x ( | ) | = | Ft. |
45 0 elbow |
|
|
|
|
|
7” Round | 30 Ft. | x ( | ) | = | Ft. |
wall cap |
|
|
|
|
|
with damper |
|
|
|
|
|
7” Round, | 30 Ft. | x ( | ) | = | Ft. |
roof cap |
|
|
|
|
|
7” round to | 8 Ft. | x ( | ) | = | Ft. |
3 1/4” x 10” |
|
|
|
|
|
rect. |
|
|
|
|
|
transition |
|
|
|
|
|
7” round to | 15 Ft. | x ( | ) | = | Ft. |
3 1/4” x 10” |
|
|
|
|
|
rect. |
|
|
|
|
|
transition |
|
|
|
|
|
90 0 elbow |
|
|
|
|
|
| Subtotal column 2 = | Ft. | |||
| Subtotal column 1 = | Ft. | |||
| Total ductwork | = | Ft. | ||
4