18-28-603.3 Metallic ducts.

All ducts shall be constructed of iron, steel, aluminum or other approved material. Ducts shall be constructed as specified in the SMACNA HVAC Duct Construction Standards – Metal and Flexible.

Exception: Ducts installed within single dwelling units shall have a minimum thickness as specified in Table 18-28-603.3.

Table 18-28-603.3
Duct Construction: Minimum Sheetmetal Thicknesses for Single Dwelling Units

Duct Size	Galvanized Steel		Approximate Aluminum B&S Gauge
Duct Size	Minimum thickness (inches)	Equivalent galvanized Gauge No.	Approximate Aluminum B&S Gauge
Round ducts and enclosed rectangular ducts
14" or less	0.013	30	26
Over 14"	0.016	28	24
Exposed rectangular ducts
Exposed rectangular ducts
14" or less	0.016	28	24
Over 14"	0.019	26	22

For SI: 1 inch = 25.4 mm

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