Fan Rotation and Discharge

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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 fan rotation top horizontal fan discharge
Bottom Horizontal
(BH)
bottom horizontal fan discharge bottom horizontal fan rotation
Up Blast
(UB)
up blast fan rotation up blast fan discharge
Down Blast
(DB)
down blast fan rotation down blast fan discharge
Top Angular Up
(TAU)
top angular up fan rotation top angular up fan discharge
Top Angular Down
(TAD)
top angluar down fan rotation top angular down fan discharge
Bottom Angular Up
(BAU)
bottom angular up fan rotation bottom angular up fan discharge
Bottom Angular Down
(BAD)
bottom angular down fan rotation bottom angular down fan discharge

 

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