UL’s marks for the gas-fired certification service appear on gas-fired appliances and equipment. These marks indicate a product’s compliance to nationally recognized gas standards, including UL, ANSI Z21/Z83 Series and CSA/CGA standards. Products carrying these marks have been evaluated to reasonably foreseeable hazards including both gas and electrical hazards. Gas-fired equipment evaluated to Canadian national standards is authorized to display the marks for Canada. Gas-fired equipment evaluated to both U.S. and Canadian standards may carry a combination mark.

There are two mark options for UL’s gas-fired equipment certification service

The UL Enhanced and Smart Marks for certification of gas-fired products appear .

An optional QR code may also appear in these marks.