Which seam can be used to join a round pipe takeoff to the side of rectangular duct?

To join a round pipe takeoff to the side of rectangular duct, the dovetail seam is particularly effective. This seam allows for a secure and aesthetically pleasing connection between dissimilar shapes, such as a round pipe and rectangular ductwork. The dovetail joint is designed to create a mechanical interlock, which enhances the stability of the connection, preventing air leakage and ensuring durability over time.

The unique shape of the dovetail seam also helps in providing an easy attachment point, as it can be formed to create a snug fit around the round pipe takeoff, while simultaneously allowing it to be firmly attached to the flat surface of the rectangular duct. This capability is essential in HVAC applications, where maintaining the integrity of the duct system is crucial for efficient airflow and system performance.

Using other types of seams, like Pittsburgh, groove, or double seams, may not offer the same level of effectiveness in joining distinct shapes, as they are typically more suited for joining similar forms or for different applications in ductwork assembly.