What type of factory seam is acceptable on duct-work?

The Pittsburgh seam is a widely accepted type of factory seam used in ductwork for several important reasons related to functionality and performance. It is a particular method of joining two pieces of metal by folding one sheet over the other to create a strong, interlocking seam that enhances the structural integrity of the duct. This type of seam is known for its ability to withstand pressure and maintain airflow, making it effective for heating and cooling applications.

Moreover, the Pittsburgh seam minimizes the risk of leaks, which is crucial for efficiently transferring conditioned air throughout a building. This leak-proof characteristic helps improve the overall energy efficiency of HVAC systems, as it ensures that the maximum amount of heated or cooled air reaches the intended areas.

Additionally, Pittsburgh seams are typically used in the manufacturing of ducts, making this seam a standard practice in the industry. This uniformity provides consistency in production and installation, further enhancing system reliability.

While other types, such as welded or slip-joint seams, can be used in specific applications, they may not offer the same level of efficiency and durability as the Pittsburgh seam in standard ductwork installations. Seamless seams, while offering superior aesthetics, can be more difficult in manufacturing and may not be practical for all types of ductwork applications.