Section 408.30916. Duct construction.

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Table 603.4 of the code is amended to read as follows:

TABLE 603.4 DUCT CONSTRUCTION MINIMUM SHEET METAL THICKNESSES FOR SINGLE DWELLING UNITS

DUCT SIZE	GALVANIZED		Approximate B&S Gauge	Aluminum
	Minimum thickness (inches)	Equivalent galvanized gauge no
Round ducts	0.013	30	26
and enclosed
rectangular
ducts
	0.016	28	24

14” or less Over 14”
Exposed		0.016	28	24
rectangular
ducts 14”	or
less
Over 14”		0.019	26	22

History: 1979 AC; 1989 AACS; 2010 AACS.

                    
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