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Duct Work Support

Duct work support and recommended distance between hangers

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The support distance for duct work is typical based upon deflection, stress and cylinder buckling analysis.

duct supports

For sheet metal duct work the space between the hangers should not exceed the distances listed below:

Horizontal Duct Work

Ducts SizeMaximum Spacing
(ft, m)
(ft2, m2)
(in, mm)
less than 4 (0.4) less than 5 (125) 8 (2.5)
(0.4) to 10 (1) 5 (125) to 38 (1000) 6 (2)
more than 10 (1) more than 38 (1000) 4 (1.2)

Vertical Duct Work

Ducts TypeMaximum Spacing
(ft, m)
round 12 (3.6)
rectangular 10 (3)
  • 1 ft2 = 0.0929 m2 = 144 in2
  • 1 ft (foot) = 0.3048 m = 12 in

Note! Support systems for duct work may provide restraint in three directions against displacement and rotation. Consideration must be given with restraining ducts to avoid development of excessive internal duct stresses caused by expansion or contraction due to temperature variations.

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