HVAC Journeyman Practice Exam

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How often should metal ducts be secured when installed vertically?

Every 3 feet
Every 6 feet
Every 10 feet
At each corner

The correct answer is: Every 6 feet

When metal ducts are installed vertically, they need to be secured at regular intervals to ensure stability and prevent sagging or movement, which could lead to air leaks or inefficient operation. The standard practice for securing these ducts is every 6 feet. This spacing helps maintain the integrity of the duct system by minimizing the risk of bending or stress that could affect airflow and system performance. Additionally, securing ducts at this interval also aligns with building codes and industry standards, which prioritize safety and functionality in HVAC systems. While securing ducts at corners is important for maintaining proper alignment and supporting changes in direction, the regular interval of every 6 feet provides adequate support along the vertical run of the ductwork. This ensures that any forces acting on the duct, such as airflow and weight, are adequately countered, maintaining system efficiency and safety.