HVAC Journeyman Practice Exam

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What should be used to fasten joints in vent connectors?

duct tape
solder joints
welded joints
sheet metal screws

The correct answer is: sheet metal screws

Using sheet metal screws to fasten joints in vent connectors is the recommended practice because these screws provide a strong and secure connection that can withstand the thermal expansion and contraction typically experienced in ventilation systems. Sheet metal screws are designed specifically for fastening metal components, offering improved durability and resistance to vibrations compared to other fastening methods. Other options, such as duct tape, may initially seem like a convenient solution, but it does not provide the necessary strength or longevity required for vent connectors, especially under varying temperature conditions. Solder joints and welded joints, while effective in other applications, are generally not used for vent connectors in HVAC systems due to the difficulty of creating a reliable seal in the presence of different materials and potential thermal movement. Therefore, the best and most reliable choice for ensuring secure and effective ventilation connections is indeed sheet metal screws.