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# Ducts - Sheet Metal Gauges

## Thickness of sheet metal used in ductwork.

Ductwork sheet metal gauges:

Ducts - Sheet Metal Gauges
(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

Ducts - Sheet Metal Gauges
Diameter
(inches)
Gauge
6 - 19 26
20 - 29 24
30 - 39 22
40 - 49 20
> 49 18

### Recommended Gages for Circular Ducts for Industrial Exhaust Work

Ducts - Sheet Metal Gauges
Diameter
(inches)
Gauge
< 9 24
9 - 14 22
15 - 20 20
21 - 30 18
> 30 16

## Related Topics

• ### Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

## Related Documents

• ### Duct Velocity

Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
• ### Ductwork - Seal Classes

Ductwork air leakage classes.
• ### Ductwork - Supports

Recommended distance between ductwork support hangers.
• ### Energy Equation - Pressure Loss vs. Head Loss

Calculate pressure loss - or head loss - in ducts, pipes or tubes.
• ### Equivalent Diameter - Rectangular vs. Circular HVAC Ducts

Rectangular equivalent diameter for air flows between 100 - 50000 cfm.

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## Citation

• The Engineering ToolBox (2008). Ducts - Sheet Metal Gauges. [online] Available at: https://www.engineeringtoolbox.com/ductwork-sheet-metal-gauges-d_1157.html [Accessed Day Month Year].

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