The Johnstone Supply website offers an online gas orifice size chart. Individuals may view, print or download the chart as a PDF from the Tools section of the Johnstone Supply website.
To view Johnstone Supply's gas orifice size chart, individuals should visit the company website and click the Technician's Corner link in the menu on the left side of the page, then select Gas Orifice Drill Table from the column on the right side of the page.
The gas orifice size chart on the Johnstone Supply website includes values for the gas pressure associated with a particular orifice size for natural gas and propane gas. Values for propane gas pressure are listed under the LP Gas column, as propane is classified as a liquid petroleum gas.