This Centrifugal Fan consists of several key parts, including the impeller, casing, air inlet, transmission section, and an adjustable damper.

1. 1. Impeller: Equipped with 16 backward-inclined blades made of Q345 (16Mn), these blades are welded between a cone-shaped cover and a flat wheel disc. The entire assembly undergoes dynamic balance correction, ensuring smooth operation and durability.
2. 2. Casing: The casing is made of steel plates, forming a volute shape. For fans No. 8 and larger, the design is standardized for both left and right-hand rotations.
3. 3. Transmission: The shaft is manufactured from high-quality steel, and the fan is equipped with ball bearings (low-noise bearings for No. 4.5-7.1). The two-part bearing housing is lubricated with calcium-sodium based grease.
4. 4. Air Inlet: The convergent-divergent air inlet is built as a single unit and is bolted to the casing.
5. 5. Damper: Y7-41 Centrifugal Fans are fitted with adjustable dampers to control airflow. Fans No. 9 and below utilize a 3-blade damper, while fans No. 10 and above use an 11-blade damper with a star-shaped design. Dampers are adjustable from fully closed (90°) to fully open (0°) positions. Proper lubrication is essential for optimal damper performance, and high-temperature grease (260℃) is used to ensure smooth operation under high temperatures.

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2. 1. Users should select the fan model based on required airflow and pressure from the performance table.
3. 2. The performance at various speeds is divided into nine points, covering 90% of the maximum efficiency range.
4. 3. Fan performance tests will ensure the total pressure deviation does not exceed 5% of the designed pressure.
5. 4. The performance table assumes gas conditions at t=180°C, Pa=101.325kPa, and p=0.776kg/m³. Adjustments should be made if these conditions vary.
6. 5. Flow rate issues may arise during operation. Variability in flow can be caused by changes in pipe network resistance or gradual blockages.

After installation, if the flow rate is too high or low, the most common causes are:
① Incorrect calculation of pipe network resistance. If the actual resistance is lower than expected, the flow rate increases; if higher, the flow decreases.
② Selection errors may occur if the fan’s actual pressure deviates from the designed pressure. A higher actual pressure increases flow, while a lower one reduces it.
If flow adjustments are needed, they can be made by changing the damper’s opening. If this does not resolve the issue, additional steps include modifying the pipe network, increasing the fan's speed (without exceeding its maximum rated speed), or selecting a new fan with higher pressure capability.