Fan Rotation and Discharge Diagrams

Fan Rotation and Discharge Diagrams

Fan rotation is determined by looking at the fan from the drive end. The drive end is is the side of the fan housing through which the fan or motor shaft protrudes. For DWDI or Arrangement 3 SWSI fans, it is the side of the fan housing at which the belt drive sheave is mounted.

For centrifugal fans, Discharge is the direction the fan outlet points.

Specification of the rotation and discharge when ordering a housed centrifugal fan is required so that the fan will fit in your system properly.

Discharge Direction Clockwise
(CW)
Counterclockwise
(CCW)
Top Horizontal
(TH)
Top Horizontal CW Top Horizontal CCW
Bottom Horizontal
(BH)
Bottom Horizontal CW Bottom Horizontal CCW
Up Blast
(UB)
Up Blast CW Up Blast CCW
Down Blast
(DB)
Down Blast CW Down Blast CCW
Top Angular Up
(TAU)
Top Angular Up CW Top Angular Up CCW
Top Angular Down
(TAD)
Top Angular Down CW Top Angular Down CCW
Bottom Angular Up
(BAU)
Bottom Angular Up CW Bottom Angular Up CCW
Bottom Angular Down
(BAD)
Bottom Angular Down CW Bottom Angular Down CCW