Introduction and Technical Structure
In HVAC systems, the ability to adjust and control airflow at various points in the duct network is essential for creating balance and optimizing energy consumption. Kian Fan Industrial Production Group has provided a simple yet effective tool for managing airflow by producing manual dampers. The body of these dampers is made of high-quality galvanized sheet, which is resistant to rust and corrosion and has a long lifespan in various environments.
The core of the damper is the flow-regulating blade, which is precisely engineered in a double-layer D-shaped design. This specific design ensures that the blade does not bend or vibrate under the pressure caused by airflow, maintaining high structural strength. The damper's operation is controlled by a manual lever that allows the blade to rotate from 0 degrees (fully closed) to 90 degrees (fully open). This wide adjustment range provides the user with precise control over the amount of passing air.

Key Features and Advantages
The most important feature of Kian Fan's manual dampers is the strength and stability of the D-shaped blade. Unlike ordinary dampers with simple blades that may deform under high pressures, the double-layer D-shaped blade offers extraordinary strength and performs the function of shutting off and connecting flow effectively. The use of galvanized sheet in the body structure guarantees the product's durability against moisture and atmospheric factors.
The manual adjustment lever provides direct and simple control of airflow without the need for electricity or expensive actuators. This reduces system costs and makes maintenance easy. Manual dampers are manufactured in various models to be compatible with different types of round and rectangular ducts. Easy installation and silent operation are other advantages of this product, making it suitable for residential and office environments.

Specialized Applications
Kian Fan's manual dampers have wide applications in ventilation systems. In residential buildings, these dampers are typically installed at the inlet of the main ducts to each room, allowing residents to increase or decrease the airflow according to their needs. In commercial and office ventilation systems, they are used for balancing airflow in different branches to ensure all parts of the building receive sufficient air.
In industries, these dampers are used to control airflow towards suction nozzles or specific blowers. Also, in kitchen and toilet exhaust systems, the manual damper allows for completely cutting off airflow when not in use, preventing the entry of unwanted air, insects, or bad odors from the duct into the building.

Conclusion
The manual dampers of Kian Fan Industrial Production Group, relying on the robust D-shaped blade design and a simple, efficient mechanism, are an economic and stable solution for airflow control. Choosing this product guarantees easy ventilation management, increased system lifespan, and reduced energy costs.