What is an example of induced draft?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

Induced draft refers to the method of air movement in a system where a fan or blower is used to actively pull combustion gases from the combustion chamber and through the flue passages. This is significant in boiler operations because it helps maintain the proper draft within the system, ensuring complete combustion and efficient removal of combustion products.

Using a fan to pull exhaust gases helps to create a negative pressure in the combustion chamber, which can enhance combustion efficiency by ensuring that ample air is drawn through the burner for optimal combustion. It serves to reduce the risk of flue gas leakage into the boiler room, thereby improving safety and performance.

The other options do not accurately describe the concept of induced draft. While a fan pushing air into the combustion chamber (the first option) is related to forced draft, it does not involve suction of gases. Natural airflow pulling combustion gases out (the second option) describes natural draft, which relies on the buoyancy of hot gases. Lastly, heating air to create a vacuum (the fourth option) does not accurately represent the mechanics of induced draft and is not how draft systems function.

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