The section is fitted with AMCA-rated double inlet, double width, forward curved or backward inclined centrifugal fan, depending on the air volume and static pressure requirements. Fan  inlets  are  aerodynamically  designed  and  wheels  statically and  dynamically  balanced  according   to  air flow rate and speed. Bearings range from either hermetic type for smaller fans, block type with self-aligning journals and split pillow blocks with grease points for larger fans. Fan drives (v-belts) are factory selected and installed to meet required performances. Motors are TEFC, class F insulation. The total blower/motor assembly is installed on a  separate  base  frame,   supported  and  isolated  from  the unit structure by spring isolators. All internal and external steel components are electrostatically powder painted or epoxy painted prior to assembly. Inlet cones are made of rust resistant fiber glass.