Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam with this comprehensive quiz. Test your knowledge with multiple-choice questions and get ready to excel in your HVAC installation career.

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What is the main drawback of the extended plenum system?

  1. Higher energy consumption

  2. Lower air velocity at the last takeoffs on the extended plenum

  3. Increased noise levels

  4. Reduced airflow pressure

The correct answer is: Lower air velocity at the last takeoffs on the extended plenum

The main drawback of the extended plenum system is that it often results in lower air velocity at the last takeoffs on the extended plenum. This occurs because as the air travels down the extended plenum, it loses some of its velocity before reaching the last takeoff points. This can lead to reduced efficiency and potentially uneven heating or cooling distribution in the building. Options A, C, and D are not the main drawbacks of the extended plenum system and do not directly relate to the specific issue of lower air velocity at the last takeoffs.

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