Introduction and Technical Structure
In the design and execution of rectangular ductwork networks, changing the direction of airflow is one of the main engineering challenges. Kian Fan Industrial Production Group, by producing standard elbows for the rectangular duct system, provides an efficient and durable solution for passing ducts over obstacles and changing routes in suspended ceilings. The structure of these elbows is completely similar to the main ducts and is made of high-quality galvanized sheets.
The production process of elbows is carried out fully mechanically; after modeling and precise cutting of the sheet by plasma machines, the bending stages are performed to create a 90-degree angle. 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 elbow 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 elbows 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 elbows is their aerodynamic design. Although changing the air path is always accompanied by pressure drop, the precise engineering of the angle and corners of the elbows at Kian Fan minimizes airflow turbulence, resulting in significantly lower pressure drop compared to non-standard samples. This leads to reduced fan energy consumption and increased overall system efficiency.

Specialized Applications
Kian Fan rectangular elbows have vital applications in all projects that use rectangular ducts. In office and commercial buildings with suspended ceilings, these elbows are used to pass ducts over joists and columns and change direction towards diffusers. In factories and industries, resistant elbows are required to guide airflow towards machine nozzles and pass over machinery obstacles.
Also, in central HVAC systems of hospitals and hotels where air sealing quality is important, the use of elbows with TDC connections and EPDM tape is essential. This product is also used in industrial exhaust systems to change the path of smoke and pollutants.

Conclusion
The elbows of Kian Fan Industrial Production Group, relying on precise machine production, standard TDC connections, and robust design, are a reliable solution for changing direction in rectangular duct systems. Choosing this product guarantees system strength, reduced air leakage, and preservation of energy efficiency at the turns of the duct network.