HVAC Sheet Metal Block 1 Practice Exam

The method classified as a "patented duct connector" is TDC and TDF. These terms refer to specific designs for duct connections that utilize interlocking profiles. TDC, or “Transverse Duct Connector,” features a flanged edge which is folded over and then secured with screws or rivets. TDF, or “Tape Duct Flange,” typically uses a manufacturer-specific design that also allows for easier installation and a better seal compared to traditional methods.

Both TDC and TDF are recognized for their effectiveness in creating a tightly joined connection between duct sections that minimizes air leakage, an important aspect in HVAC systems for ensuring energy efficiency. Their patented design allows for enhanced structural integrity and performance characteristics, making them a preferred choice among professionals in the industry.

Other methods like S and Drive, Pittsburgh seams, and Button lock, while commonly used in ductwork assembly, are not classified as patented connectors, indicating they may not offer the same level of proprietary design advantage or may lack the specific features that TDC and TDF provide.