These fans are in group of forward-curved (FC) blade fans. FC fan blades lean towards the rotation of the impeller. These fan give large amounts of air flow at low static pressures. However these fans work at the lower efficiencies.

These fans are in group of backward-curved (BC) blade fans. These type fans’ blades lean backwards the rotation of the impeller. This fan’s performance characterized by high-efficiency, large air flow, rigid construction.

These fans are in group of backward-curved (BC) blade fans. Belt-driven motor is used. These type fans’ blades lean backwards the rotation of the impeller. This fan’s performance characterized by high-efficiency, large air flow, rigid construction.