As the gauge number increases the material thickness decreases.
Hvac sheet metal gauge.
Ductwork sheet metal gauges.
For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material.
Ferguson is the 1 us plumbing supply company and a top distributor of hvac parts waterworks supplies and mro products.
Sheet metal thickness gauges for steel are based on a weight of 41 82 pounds per square foot per inch of thickness.
Galvanized sheet metal ducts from the duct shop s hvac ductwork is manufactured from high quality galvanized steel in 3 foot lengths for easy handling.
Sheet metal gauge size chart gauge or gage sizes are numbers that indicate the thickness of a piece of sheet metal with a higher number referring to a thinner sheet.
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Sounds to me that the guy with the 30 gauge may be buying it from a supply house who sells it pre made i dont know to many sheet metal shops who make duct work in 30 i prefer 26 myself and think a sheet metal shop that makes it in house is much better than the pre made.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.
This is known as the manufacturers standard.
This sheet of 30 gauge galvanized steel has a maximum temperature rating of 390.
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The master flow 36 in.
A sheet metal gauge sometimes spelled gage indicates the standard thickness of sheet metal for a specific material.