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Ducts - Sheet Metal Gauges

Sheet metal gauges used in ductwork

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Ductwork sheet metal gauges:

CommentsSheet Metal GaugeSheet Thickness
(inches)
Welded Ductwork 0 0.3120
1 0.2810
2 0.2650
3 0.2500
4 0.2340
5 0.2187
6 0.2030
7 0.1875
8 0.1720
9 0.1560
10 0.1400
11 0.1250
12 0.1090
13 0.0937
14 0.0780
15 0.0700
SMACNA1) Ductwork 16 0.0625
17 0.0560
18 0.0500
19 0.0437
20 0.0375
21 0.0343
22 0.0312
23 0.0280
24 0.0250
25 0.0218
26 0.0187
Not Suited for Ductwork 27 0.0170
28 0.0156
29 0.0140
30 0.0125
31 0.0109
32 0.0100
33 0.0093
34 0.0085
35 0.0078
36 0.0070
  •  1 inch = 25.4 mm

Recommended Gages for Circular Ducts for Heating and General Ventilation Work

Diameter 
(inches)
Gage
6 - 19 26
20 - 29 24
30 - 39 22
40 - 49 20
> 49 18

Recommended Gages for Circular Ducts for Industrial Exhaust Work

Diameter 
(inches)
Gage
< 9 24
9 - 14 22
15 - 20 20
21 - 30 18
> 30 16
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