This article will show the main parts of industrial fans and their functions. The picture above is a simple illustration of these parts discussed.

Inlet cone: It is used for leading air into the housing. As another function, it helps links fan to pipes. Fan type and dimensions decide the dimensions and shaped of inlet cones.

Impeller: It is the core part of the fan. Mounted with blades, it is rotating component, classified into forward, backward or radial blades according to different uses.

Housing (or Casing ): It is the structure for housing the impeller. The air passes through the housing before moving toward the ventilation system for handling. Particularly, the air gets compressed in the housing with its speed increased. Fan performance is decided by the impeller physiognomy and housing shape too.

Inspection door: It is an access door on the housing so that inspections or maintenance can be performed.

Motor pedestal: It is the support on which the fan is mounted. There is direct motor pedestal used in direct driven fans or bearing block pedestal used in belt driven fans. For big sized fans, the pedestal is welded on the case.

The bearing block (support) includes shaft and bearings. It is responsible for the transmission of the industrial fan. The bearing block has to take the load from such mechanical forces as velocity and couple related to fans of belt drive type.  

Cooling wheel: It is a smaller part on the impeller hub used on fans of direct drive type or on the support shaft for fans of belt drive type. It is used for heat dissipation of the airflow and to prevent damages caused to such parts as engine or the support.

Belts and Pulleys: They are used for transmission for fans of belt drive type. Only qualified technicians are allowed to choose belts and pulleys. The pulleys are keyed to the shaft.

Carter for transmission: The purpose is to offer protection to the belt by external agents, and at the same time, to make the belt safer. By doing this, personnel contact with the moving belt can be avoided, in particular when the belt breaks.  

Unitary base: It is to support the fan of the belt drive type. The single base connects the motor and the fan to serve as a support base for fan installation.

Flag motor pedestal: It is the motor base on the chair side, where the motor is fixed on.

Axial impeller: It is the rotating part of axial fans, mounted with airfoil blades with cast aluminum. It comes in different forms and vital component for directing airflow.  

Fan Housing (or drum): It is the housing of the axial flow fan. It has a welded base for the engine.

Belt driven axial housing: It is the drum for the fan of the belt drive type. The support is fixed on the base and through the transmission it is connected to the external engine.