Introduction and Technical Structure
In modern rectangular ductwork systems, there is a constant need for connections that offer both high strength and increased installation speed. Kian Fan Industrial Production Group, by producing the TDC (Transverse Duct Connector) flange, has provided a standard and optimized solution for connecting rectangular parts. The structure of this flange includes U-shaped galvanized profiles that are bent and drilled using precise machinery.
These flanges are designed to be placed on the outer edges of rectangular ducts (which are prepared as cut or folded edges). The connection mechanism involves placing the TDC flange on the ends of adjacent ducts and compressing them together using special corners at the four vertices and cleats along the seam. This method eliminates the need for bolts and nuts along the entire length of the connection, simplifying the assembly process.

Key Features and Advantages
The most important feature of Kian Fan's TDC flange is the combination of strength and speed. Due to their profile structure, these flanges create high bending resistance, which is essential for large-sized ducts and medium to high pressures. Using EPDM sealing tape between the flange edge and the duct ensures that once the cleats are closed, the connection joint is completely sealed and air leakage is minimized.
Eliminating longitudinal bolting (Angle Iron Flange) and replacing it with the TDC system reduces installation time by up to 50% and lowers labor costs. The smooth internal surface of the duct at the TDC connection point, compared to traditional methods, reduces pressure drop and airflow turbulence. Additionally, these flanges allow for re-opening for service or repairs.

Specialized Applications
Kian Fan's TDC flange has widespread applications in all projects using rectangular ducts. In office buildings, commercial centers, and shopping malls where extensive duct networks exist in suspended ceilings, these flanges are an ideal choice due to their installation speed and reduction in duct occupied height. In factories and industries, TDC flanges provide the necessary strength for high-flow air ducts.
Also, in central HVAC systems where compliance with air leakage standards (such as SMACNA) is mandatory, using TDC flanges alongside EPDM gaskets guarantees system quality. This product is also suitable for connecting insulated ducts, as it applies uniform pressure to the insulation and prevents damage.

Conclusion
The TDC flange of Kian Fan Industrial Production Group, relying on engineered design and robust structure, has established a new standard in rectangular duct connections. Choosing this product guarantees increased execution speed, reduced costs, and improved aerodynamic performance of the ventilation system.