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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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Related Topics
- Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more
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Related Documents
- Ductwork Sheet Metal Gauges - Sheet metal gauges used in ductwork
- Hanger Spacing and Rod Size for Horizontal Pipes - Recommended maximum span between hangers - and rod sizes for straight horizontal pipes
- Sizing Ducts - The ductwork of ventilation systems are often sized with either the Velocity, the Constant Pressure Loss (or Equal Friction Loss) - or the Static Pressure Recovery Methods
