What is Metal and Air Conditioning Contractors National Association (SMACNA)

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What is (SMACNA) Metal and Air Conditioning Contractors National Association 

Metal and Air Conditioning Contractors National Association (SMACNA) 

SMACNA standards for the ducting sheet gauges

As per SMACNA the gauges of ducting sheet varies and depends upon the width of the duct and type of application of a particular project. Here are the few gauge system as per SMACNA standards.

 Example: low and medium velocity duct system

26 gauge is use for the duct size below 300 mm (12") and thickness 0.5 mm

24 gauge is use for the duct size up to 750 mm (30") and thickness is 0.6 mm

22 gauge for duct size up to 1200 mm (48") thickness 0.8 mm

20 gauge for duct size above 1200 mm to 3000 mm (48"-120") thickness 1 mm

18 gauge for duct size above 3000 mm (120") thickness 1.2 mm

16 gauge for machine cabinet  thickness 1.6 mm.

For high velocity duct system gauge ranges from 26 to 16 but thickness is different.

Note: commonly for G.I sheet 22 and 24 gauge are used in actual practice.