Centrifugal Fan Inlet unilateral intake (single suction) intake and bilateral (double suction) two.
Single suction fan is divided into single-sided double-stage impeller stage impeller two kinds of unilateral. In the same context, the two-stage pressure impeller produces twice the single-stage impeller.
Single-stage double-suction fan is double-sided intake, single-stage impeller structure. In the same context, the traffic generated by these fans is twice the single suction.
In special cases, equipped with centrifugal fan inlet plenum, the impeller press the left or right direction of rotation, each with different inlet angles fifth position.