What is the most common type of burner found in an induced draft furnace?

The most common type of burner found in an induced draft furnace is the inshot burner. This type of burner is designed to effectively mix gas and air to achieve an optimal combustion process. Inshot burners use the principle of a venturi to create a low-pressure area, which draws the air into the burner and mixes it with the gas before ignition. This allows for efficient combustion and helps control the flame characteristics, making it suitable for the operation of induced draft furnaces where consistent and reliable heating is essential.

Induced draft systems enhance safety by using a fan to pull combustion gases out of the furnace, ensuring that the flue products are effectively vented to the outdoors. The inshot burner complements this system by providing good operational stability and efficiency, which is why it is commonly utilized in residential and commercial heating applications.

In contrast, other types of burners like carburetor burners, atmospheric burners, and single-stage burners are either less common or not specifically suited to the design and operating conditions of an induced draft furnace. Each of these alternatives does have its own applications, but the inshot burner’s design aligns best with the needs of induced draft systems, especially regarding efficiency, safety, and effective combustion.