Introduction and Technical Structure
In the design and execution of rectangular ductwork networks, especially in large and industrial buildings, the need to divide airflow into multiple branches at a single point is common. Kian Fan Industrial Production Group, by producing standard crosses for the rectangular duct system, provides an engineering and precise solution for managing the most complex airflow divisions. The structure of these crosses is completely similar to the main ducts and is made of high-quality galvanized sheets.
The production process of crosses is carried out fully mechanically; after 3D modeling and precise cutting of the sheet by plasma machines, the bending stages are performed to create the geometric shape of the cross with standard angles. The edges of the sheet are connected to each other using the Pittsburgh seam, which creates a strong and integral connection. To increase strength and prevent deformation of the cross due to air pressure, transverse reinforcing beads are created on the body surface. If necessary for high pressures, additional reinforcing rods can also be used.

Connection System and Features
The connection of crosses to other components of the rectangular duct system, like the main ducts, is done using TDC (Transverse Duct Connector) flanges. This connection method includes flange profiles, corners, and cleats which accommodate the duct surface in a sliding manner. To guarantee complete sealing and prevent air leakage at the connection point, EPDM sealing tape is used between the flanges.
One of the important features of Kian Fan crosses is their aerodynamic design. The sudden division of airflow into three paths can cause significant pressure drop; however, the precise engineering of internal angles and corners at Kian Fan ensures that airflow is directed to the branches with minimal turbulence and friction. This helps maintain system efficiency and reduce fan energy consumption.

Specialized Applications
Kian Fan rectangular crosses have widespread applications in projects with high ductwork density. In large office and commercial buildings, these crosses are used to distribute air from a main duct to multiple offices or adjacent spaces at a single point. In factories and industries, this product is essential for feeding multiple production lines or machines from a single main source of compressed air or suction.
Also, in central HVAC systems of shopping centers and airports where wide coverage with minimal pressure drop is required, crosses with TDC connections and EPDM tape are an optimal choice. This product is also used in dust collection systems and industrial chimneys to consolidate multiple outlets into a single main source.

Conclusion
The crosses of Kian Fan Industrial Production Group, relying on precise machine production, standard TDC connections, and robust design, are a reliable solution for flow division in rectangular duct systems. Choosing this product guarantees effective air distribution, reduced leakage, and increased ventilation system efficiency in complex projects.