2
3. Storage
Novax smoke exhaust fans type ACN-
smoke can stand outdoor storage for 1
month provided the packing is intact.
Fans with no packing must be stored in
a sheltered place.
If the fans are stored indoors under well-
ventilated conditions with no risk of con-
densation the storage period may be ex-
tended to 6 months. The storage place
must not be exposed to vibrations likely
to damage the motor bearings.
If the storage period exceeds 3 months, it
is recommended to turn the impeller re-
gularly by hand.
4. Installation
4.1 Prior to attachment
Prior to attachment make sure that the
impeller rotates freely in the fan casing,
wherever possible with equal distance
between blade tip and fan casing throug-
hout the circumference.
4.2 Attachment
Fans must always be installed so that the
rotating parts cannot be touched. The fan
must be provided with a wire guard on
the inlet and outlet sides. If ducts are con-
nected, they should be provided with
wire guards on the inlet side.
The fan is provided with an arrow-plate
denoting the direction of air flow
through the fan casing. See during instal-
lation that the fan is oriented so as to pro-
vide the desired direction of air flow in
the system.
The best way of installing the fan is using
mounting feet (available as optional ex-
tras), but it may also be suspended in the
fan casing flanges or in special carriers.
The carriers must not hamper the free in-
let and outlet of air.
When the fan has been finally secured
make sure that the impeller rotates freely
in the casing.
If the motor is provided with drain holes
for condensed water the fan must be ori-
ented so that the holes turn downwards
(lowest point).
Generally, it is of the utmost importance
for the performance and sound level of
an axial flow fan that the air flow is un-
impeded and free from eddies.
4.3 Mounting feet
Mounting feet for type ACN-smoke con-
sist of two mounting plates (see fig.
1item 01).
Mount two stiffeners (item 02) between
these by means of joining elements (item
03). Stiffeners are only available from fan
size 630 mm inclusive.
To prevent vibrations spreading from the
fan to the surroundings, anti-vibration
mountings may be inserted between fan
and support and flexible connections fit-
ted in the ducts before and after the fan
(available as optional extras).
Secure anti-vibration mountings (fig. 2
item 06) in the mounting feet by means of
bolts (item 05).
Mount base plates (item 07) for attach-
ment in the foundation/floor at the bot-
tom of the rubber element.
The natural frequency of the support
must differ at least 20% from the fan
speed.
The anti-vibration mountings serve to
ensure that the natural frequency of the
system does not exceed 10 Hz and that
the damping is at least 80% at 1500 r.p.m.
Figure 1. Mounting foot for type ACN
Figure 2. ACN with mounting foot and antivibration mountings
