Which of the following is not considered a type of gas burner design?

A blast tube is not typically considered a type of gas burner design. In the context of gas appliances and combustion technology, burner designs generally focus on how the gas is mixed with air and the method of delivering that mixture for efficient combustion.

Atmospheric burners rely on natural draft created by the temperature difference between the combustion gases and the surrounding air. They utilize the buoyancy of hot gases to draw in air for combustion.

Forced draft burners, on the other hand, use a fan to push air into the combustion chamber, which assists in achieving the necessary air-to-gas ratio for efficient burning.

Power burners also employ a fan system but are known for their ability to deliver a higher capacity of gas and air, allowing for a more controlled and high-efficiency combustion process.

In contrast, a blast tube does not fit into these established categories of gas burners. Its design is generally related to introducing air and fuel in combinations that are not primarily geared toward efficient, controlled combustion in appliances, thus distinguishing it from true burner types.