Where is the orifice on a gas furnace?

The orifice on a gas furnace is typically located in the burner assembly, where it regulates the flow of gas into the burners. It is usually situated near the gas valve and can be accessed by removing the furnace cover. The orifice size can be adjusted or replaced to accommodate different types of gas or to optimize combustion efficiency. Always ensure safety precautions are followed when working with gas appliances.