Direction and Angle of Centrifugal Box-Type Fans

Direction and Angle of Centrifugal Box-Type Fans

Centrifugal box-type fans are perfectly straight with no angles; they can be distinguished simply by identifying the air inlet and outlet. However, in centrifugal box-type fans, air enters along the axial direction and is discharged radially after rotation. When the air inlet is aligned with the shaft, the fan can rotate in two directions. This requires specifying the rotation direction of the centrifugal box fan. For radial discharge, a variety of discharge angles can be selected. This requires specifying the angle of the centrifugal box fan. For descriptions of direction and angle, refer to the drive end and impeller of the fan. For Type A units, this refers to the motor end; for Type C and Type E units, it refers to the end connected to the driven pulley. The upper airflow is 90 degrees, and the lower airflow is 2700 degrees. In addition, 45 degrees, 135 degrees, 225 degrees, and 315 degrees are commonly used. It is important to note that not all types of centrifugal box-type fans offer a choice among these eight angles; standard products are typically available only in three angles: 0°, 90°, and 180°. The direction and angle of centrifugal fans are usually fixed and cannot be freely changed after manufacture. The 13-48 model allows for switching between three angles, but the direction cannot be changed. The direction and angle of centrifugal box-type fans are usually fixed and cannot be freely changed. Therefore, to ensure the suitability of centrifugal box-type fans, most require a description of their direction and angle. This requires special attention. Some air conditioning centrifugal box-type fans or accessories—specifically, impellers without a drive end—cannot be clearly defined and thus do not require a description of direction and angle.