Bi-coaxial Fan : 

Direct-driven high-performance Bi-axial Flow Fan, designed for the efficient ventilation system. Fans and blades are designed to reduce operating costs with improved efficiency design offer inherently lower sound levels than other axial fans.

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Bi-centrifugal Fan :

Centrifugal fans extract air at a right angle to the intake of fan then centrifugal force turn the air outward to the exit. Fan drum is a set of blades placed on a rotating hub which increased the pressure of incoming airflow. 

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