2
It is important to provide sufficient free
space for assembling and dismantling
the system and to facilitate cleaning and
maintenance.
4.1 Preparation
Measure out and mark the hole to be cut
for the fan on the panel itself.
If existing duct height necessitates stand-
ing the fan on a raised base or support,
this should be prepared first.
Then measure the height from the base to
the centre of the fan and mark this posi-
tion on the panel. Drill a hole through the
panel at the centre point.
Mark the circumference of the hole on
both sides of the panel using, for exam-
ple, a cord and felt-tip pen as a drawing
compass.
Check the measurements and markings
before cutting the hole.
Cut the hole through the panel and any
insulating material. Smooth any rough
edges.
Fit and secure edging strip.
4.2 Installing the fan
ACL fans are supplied ready to install,
with factory-fitted mount, guides, cross
supports, protective grille and end plate.
Loosely position accompanying rails on
base where fan is to stand.
Then place fan on rails and push into po-
sition against stops on rails so that fan is
aligned with hole cut in panel beside
stops. Note that rails are held securely in
place by fan after it has been positioned
on them.
Push fan along cross supports towards
panel until end plate and panel are in
close contact.
Horizontally centre fan in relation to
hole in panel.
Screw mount securely to cross supports.
Check position of fan in relation to hole
in panel and adjust if necessary. Check
that end plate is in close contact with
panel.
Secure fan in position with screws
through guides and rails and through
rails and base.
Before tightening screws, adjust rails to
ensure they are parallel with panel.
Firmly tighten screws holding guides
and rails in place.
Screw rod holders to panel. Secure fan by
fitting rod to panel across end plate
above fan housing.
Turn impeller by hand to check that it can
freely rotate in fan housing. Check also
that clearance between impeller blade
tips and fan housing is equal all the way
round.
4.3 Installing the acoustic dif-
fuser (optional)
Fit sealing strip to outside panel surface
around circumference of hole. See
figure 3.
Centre diffuser opposite fan.
Attach diffuser to panel using self-cut-
ting screws.
Adjust inner core of diffuser to provide
1-1.5 cm clearance between core and fan
motor.
Sizes
Centre height Diameter
Hub di
am
et
er
23
0,
33
0 and 38
0
400
403
535
500
403
635
560
413
695
630
503
775
710
503
855
800
603
945
900
753
1065
Table 2. ACL fan dimensions [mm]
Figure 1. Measurements for cutting hole in panel
Figure 2. Installing the fan
h
r
Rod
End plate
Guide
Cross support
Rail
Mount
Panel
