Kruger ADA Series General Instructions Manual page 6

GUIDELINES FOR CENTRIFUGAL FAN INSTALLATION
Improper installation with inlet or discharge configurations may result in reduced performance. Restricted or
unstable flow at the fan inlet can cause pre-rotation of incoming air or uneven loading of the fan wheel
yielding large system loss and increase sound levels. Free discharge or turbulent flow in the discharge
ductwork will also result in system effect losses.
Ducted Inlet Installation
 Inlet Duct Turns
1 fan
wheel
dia.
Turning
Vanes
GOOD
Ducted Outlet Installation
 Discharge Duct Turns
Rotation
( at least 3 equivalent duct Ø )
Non- Ducted Installation
 Non-Ducted Inlet Clearance
1 Fan
Wheel Dia.
POOR
Length of
straight duct
GOOD
 Inlet Spin
Turning
Rotation
Vanes
GOOD
Rotation
POOR
 Free Discharge
Free or abrupt discharge into plenum results in a
reduction in fan performance. Effect of static regain
is not realized.
Rotation
POOR