Supporting Ductwork
Ductwork support and recommended spacing between hangers
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Support spacing for the ductwork is typical based upon deflection, stress and cylinder buckling analysis.
For sheet metal ductwork the spacing between hangers should not exceed the maximum distances listed in the table below.
Horizontal Ductwork
| Ducts Size | Maximum Spacing (Feet) |
|
| Area (Sq.Ft) |
Diameter (Inches) |
|
| less than 4 | less than 5 | 8 |
| 4 to 10 | 5 to 38 | 6 |
| more than 10 | more than 38 | 4 |
Vertical Ductwork
| Ducts Type | Maximum Spacing (Feet) |
| round | 12 |
| rectangular | 10 |
- 1 ft2 = 0.0929 m2 = 144 in2
- 1 ft (foot) = 0.3048 m = 12 in
Note! The support systems for ducting may provide restraint in three directions against displacement and rotation and consideration must be given when restraining ducts to avoid the development of excessive internal duct stresses such as possible expansion or contraction due to temperature variations.
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