Red Seal Sheet Metal Worker Practice Exam

What type of joint is typically used for ductwork connections?

1. Overlap joint

2. Butt joint

3. Standing seam joint

4. T-joint

The correct answer is: Standing seam joint

The standing seam joint is commonly used for ductwork connections because it provides a strong, continuous connection that helps to ensure air tightness and minimize leakage in the duct system. This type of joint is particularly effective for handling the expansion and contraction that can occur with temperature changes, as it allows for some movement without compromising the integrity of the connection. Standing seam joints are also advantageous because they create a smooth surface, which can enhance airflow efficiency within the ductwork. Additionally, they facilitate easier assembly and disassembly, which is important for maintenance and adjustments in HVAC systems. In contrast, other types of joints like overlap joints and butt joints may not provide the same level of air tightness or may require additional sealing methods to prevent leaks. T-joints, while useful in specific configurations, may not be as effective for the enduring connections required in ductwork. Thus, the standing seam joint is the preferred choice for ensuring durability and performance in ductwork applications.