Introduction and Technical Structure
In HVAC systems, it is often necessary to branch off flexible (round) ducts from main rectangular ducts hidden in suspended ceilings to feed diffusers or connect to devices. Kian Fan Industrial Production Group, by producing the connector for flexible connection of round and rectangular parts, has provided a standard and efficient solution for these intermediate points. The structure of this product is an engineered transition where one side is designed as rectangular (for connection to the main duct or TDC flange) and the other side is round (for connection to flexible duct or round diffuser).
This piece is made of high-quality galvanized sheet and, if more flexibility is needed at the installation point, may include a section of flexible pipe or a special design that allows for angle adjustment. The rectangular edges of the connector are typically prepared for connection to the TDC flange system, and its round edge features a tab or groove for securely connecting the flexible duct or a special clamp.

Key Features and Advantages
The most important feature of this connector is creating a standard connection between two different geometries (round and rectangular). Without using this piece, installing flexible duct on a rectangular duct is often accompanied by non-principled cuts and the use of temporary adhesives, leading to air leakage and poor appearance. Kian Fan's connector professionalizes this process and creates a strong and permanent connection.
The aerodynamic design of this product ensures that airflow encounters minimal turbulence and pressure drop when passing from the rectangular to the round cross-section. Flexibility in installation allows for precise adjustment of the diffuser or flexible duct position relative to the main duct. The use of resistant galvanized material guarantees the product's durability against moisture and corrosion. Also, these connectors are usually designed so that installation and replacement are easily possible in case of service needs.

Specialized Applications
These connectors have applications in diverse projects. In residential and office buildings, this piece is used to connect round ceiling diffusers (which are often connected to the duct via flexible duct) to main rectangular ducts. In industrial kitchen and restaurant ventilation systems, this connector plays a vital role in connecting round hoods to rectangular chimney ducts.
Also, in factories and production lines, this product is used to connect devices with round outlets to rectangular dust collection networks. In VRF systems and ducted splits, Kian Fan's flexible connectors are the best option for connecting round air valves to ceiling rectangular ductwork.

Conclusion
The connector for flexible connection of round and rectangular parts by Kian Fan Industrial Production Group, by solving the challenge of connecting different geometries, provides a practical and high-quality solution for engineers and contractors. Choosing this product guarantees standard installation, reduced air leakage, and the necessary flexibility in designing ventilation systems.