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What length should approved hangers that support ducts not exceed (at intervals)?



A. 5
B. 10
C. 8
D. 25

This question is part of HVAC Journeyman Prep Test
Asked by Coulter, Last updated: Jul 07, 2020

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3 Answers

Anthony Paul Bonadio

Its kind of my job to give answers

Anthony Paul Bonadio, Teacher, MCA, PhD, Toledo

Answered Jan 29, 2019

The correct answer to this question is B. In HVAC (heating, ventilation, and air conditioning) there are two shapes of vertical ductwork: round and rectangular. For sheet metal ductwork, specified distances between hangers are given. With round vertical ductwork, the distance between hangers should not exceed 12 feet.

For rectangular vertical ductwork, the maximum distance between hangers is 10 feet. These distances were calculated based on the support needed to avoid distortion, buckling, and stress. Industry standards have been created and set at the international level, as well as in many individual countries around the world.

 

John Adney

John Adney

Answered Dec 05, 2017

2012 IMC 603.10 " ducts shall be supported at intervals not to exceed 12 ft"

 

John Smith

John Smith

Answered Jan 27, 2017

10
 

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