Introduction and Technical Structure
In air transfer systems, choosing the correct method for connecting parts has a direct impact on cost, execution speed, and the final quality of the project. Kian Fan Industrial Production Group, by offering the internal (sliding) connection, presents a traditional yet optimized method for connecting spiral ducts with small diameters. The structure of this connection is designed such that a pipe piece with a diameter slightly smaller than the main duct diameter is placed inside the ends of the two duct branches in a sliding manner.
This connection method is specifically designed for ducts with a diameter of less than 50 centimeters. In these dimensions, complex connections and expensive flanges are not economically justified, and the sliding connection offers the best performance. After placing the connecting piece inside the duct, aluminum sealing tape (Foil Tape) or mastic (Sealant) is used to stabilize the position and create a complete air seal. These materials prevent air leakage at the joint and maintain system efficiency.

Key Features and Advantages
The most important feature of Kian Fan's internal connection is its simplicity and low cost. The lack of need for complex flanges, rivets, or special installation tools drastically reduces material and execution costs. Due to its simple design, this connection increases installation speed and shortens project delivery time.
Proper air sealing using aluminum tape or mastic guarantees minimum air leakage. In low-diameter ducts, air pressure is usually lower, and the sliding connection can easily withstand this pressure. The lightweight connection also reduces the dead load of the system. This type of connection creates significant savings in the project budget, especially in long paths where the number of connections is high.

Specialized Applications
Kian Fan's internal (sliding) connection has wide applications in small and medium projects. In residential and apartment ventilation systems where duct diameters are usually less than 50 centimeters, this connection method is considered standard and economical. In restaurants, cafes, and shops, this connection is used to connect hoods and smoke exhaust ducts.
In light industrial ventilation systems and low-diameter dust extraction lines, the sliding connection performs optimally. Also, in renovation and reconstruction projects where there are budget limitations, replacing expensive connections with sliding connections can help manage costs. This connection is also very suitable for connecting sub-branches to the main duct in suspended ceilings.

Conclusion
The internal (sliding) connection of Kian Fan Industrial Production Group, relying on simplicity, efficiency, and suitable price, is a smart solution for connecting small-diameter ducts. Choosing this product guarantees fast project execution, cost reduction, and maintenance of air sealing quality in ventilation systems.