Residential HVAC Installation Practice Exam

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Prepare for your Residential HVAC Installation test with our engaging quizzes and in-depth multiple-choice questions. Each question comes with hints and detailed explanations to ensure mastery of the subject matter. Get ready for your exam and boost your confidence!

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What is the purpose of a reducing plenum in a duct system?

Increases airflow pressure
Reduces noise levels
Uniformly distributes air to the ducts
Reduces the size of the ductwork as it comes off the main plenum

The correct answer is: Reduces the size of the ductwork as it comes off the main plenum

A reducing plenum in a duct system serves the purpose of reducing the size of the ductwork as it comes off the main plenum. This is important because it allows for a gradual reduction in duct size to match the airflow requirements of the individual branches or rooms in the building. By tapering down the size of the ductwork, the reducing plenum helps to maintain proper air velocity and pressure throughout the system, ultimately ensuring efficient and effective HVAC operation. Options A, B, and C are incorrect because a reducing plenum is specifically designed to decrease the size of the ductwork and is not primarily intended to increase airflow pressure, reduce noise levels, or uniformly distribute air to the ducts.