Supporting Ductwork

Ductwork support and recommended spacing between hangers

Support spacing for the ductwork is typical based upon deflection, stress and cylinder buckling analysis.

duct supports

For sheet metal ductwork the spacing between hangers should not exceed the maximum distances listed in the table below.

Horizontal Ductwork

Ducts SizeMaximum 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 TypeMaximum 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.

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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