To those survivors of Burner History 102, welcome to Burner History 103. You've reached the final step in the course series on premix burners. Just in case you've forgotten everything you learned in Burner History 101 and Burner History 102, I'll do a quick overview of their high points.
Premix burners were the first purpose-designed burners, and they can be traced back more than 100 years to the Bunsen and similar laboratory burners. A premix burner system really consists of two key components, the burner head or nozzle, and the gas-air mixing device that feeds it. In some cases they're built as a single unit. The mixer uses the energy of a pressurized stream of air and/or gas to mix the two and present them to the burner nozzle, which provides an ignition and anchoring point for the flame and controls its shape.