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How can determine the duct gauge in a ductwork system for the cooling/ heating systems?

+1 vote
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G.I. Sheet Thickness.
asked Sep 28, 2015 by Arjun Chavan

2 Answers

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Duct gauge is related to the largest duct dimension (width or length) and static pressure (positive or negative pressure). The SMACNA (Sheet Metal & Air conditioning Contractors’ National Association) has classified the duct gauges per dimension and pressure.

Below is the sample tables from SMACNA for different static pressure which usualy are used in a comfort cooling/ heating systems:

 

 

 

 

answered Oct 14, 2015 by Matt Hall
+1 vote
SMACNA is the most common standards to be used in the United States.  British Standards are commonly used in Europe.  Hoewver, the thickness of the duct thickness is not the only consideration during the design, you need to look into the tightness requirements(leakage) as well.  Some of the States in the US set up their standards which is more strigent than SMACNA, you need to check the local codes.  OSHPD, Medical Facilities and Laboratories also have tighter requirements on both material thickness and tightness.
answered Oct 15, 2015 by Yalek Ho

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