Greenheck AX (464664) - Manual (Page 3)

3 Axial Fan
Fan models AX, AX-V or AX-S are to
be lifted using a minimum of four (4)
points on the fan housing or attach
two suitable chains/straps around
the entire fan housing, one near each
duct flange.
For flange mounted fans, attach
suitably sized chains or lifting straps
to two locations on the inlet and
outlet flanges as shown.
For fans with Universal Mounting
brackets, use brackets for lifting
connection points.
Lifting Effects of Installation on
Performance
Any installation with inlet or discharge configurations
that deviate from these recommendations may result in
reduced fan performance. Restricted or unstable flow
at the fan inlet can cause pre-rotation of incoming air or
uneven loading of the fan propeller yielding large system
losses and increased sound levels. Free discharge or
turbulent flow in the discharge ductwork will also result
in system effect losses.
The most common inlet and discharge conditions which
affect fan performance are:
Installation of a duct turn or elbow too close to the
fan inlet reduces fan performance because air is
loaded unevenly into the fan prop. To achieve full fan
performance there should be at least one to two fan
diameters between the turn or elbow and the fan inlet.
Inlet Duct Turns
Discharge Duct Turns
Fan performance is reduced when duct turns are made
immediately off the fan discharge. To achieve cataloged
fan performance, there should be at least three
equivalent fan diameters of straight ductwork between
the fan discharge and any duct turns.
Good
Poor
3 Diameters of
Straight Duct
1 Fan
Dia.
Vanes
Good Poor
Turning
Standard
Long Casing
Optional
Vane Section
Optional
Short Casing
Fan model AX-U are to be lifted
using the four (4) windband gussets
located between the butterfly
damper section of the fan and the
exterior windband unless welded
lifting lugs are provided on fan
housing. Welded lifting lugs are
present on AX-113 thru AX-160.
A spreader bar is recommended
to prevent damage to the damper
section when lifting.
Optional
Roof Upblast
®