2
3. Storage
Axial flow fans type ACP and ACG can
stand outdoor storage for one 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
condensation the storage period may be
extended to six months.
The storage space must not be exposed to
vibrations likely to damage the motor
bearings. If the storage period exceeds
three months, it is recommended to turn
the impeller regularly by hand.
4. Assembling
4.1 Installation
Novax axial flow fans types ACP and ACG
are designed for operation in both
horizontal and vertical position. (Know-
ledge of installation position is required
before drilling of drain holes).
ACP is for free inlet and without
connection to duct on the pressure side.
ACG is for free inlet and connection to duct
on the pressure side. (Downstream guide
vane arrangement).
4.2 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
throughout the circumference.
4.3 Attachment
The fan is provided with an arrow-plate
denoting the direction of air flow through
the fan casing. See during installation that
the fan is oriented so as to provide the
desired direction of air flow in the system.
The best way of installing the fan is using
mounting feet (available as optional extras,
fig. 4), but it may also be suspended in the
fan casing flanges or in special carriers.
The carriers must not hamper the free inlet
and outlet flow of the air.
When the fan has been finally secured
make sure that the impeller rotates freely in
the casing.
.
4.4 Mounting feet
Mounting feet for types ACP and ACG
consist of two mounting plates (fig. 4 items
01 and 02). Mount two c-profiles (item 03)
under these by means of bolts (item 05) and
nuts (item 04).
The distance between the end of the c-
profile and mounting plates is determined
by type/size and motor size.
Mount the fan casing in the two flange
holes of the mounting plates and mount the
distance bush (fig. 5, item 07) by means of
joining elements (items 08 and 09) between
inlet cone and mounting plate (item 06).
The fan houses for ACP and ACG sizes
1250 – 1600 have circular fan casings.
Therefore, the fan casing is mounted with
fittings for mounting foot (fig. 6 item 07A)
and joining elements (fig. 6 items 08A and
09A).
Mount the fittings on the back of the
mounting foot and fan casing as shown on
fig. 6.
To prevent vibrations spreading from the
fan to the surroundings, anti-vibration
mountings may be inserted between fan
and support and flexible connections fitted
in the ducts after the fan (available as
optional extra).
Secure anti-vibration mountings (fig. 5
item 10) in the ends of the c-profile by
means of bolts (item 11).
Mount base plates (item 12) for attachment
in the foundation/floor at the bottom of the
rubber element.
The natural frequency of the support must
differ at least 20% from the fan speed.
If the motor is provided with drain holes
for condensed water the fan must be
oriented 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
unimpeded and free from eddies.
4.5 Duct connection
A downstream guide vane arrangement
with core is mounted on the Novax axial
flow fan with which the fan obtains a very
high efficiency and is used for connection
to duct.
The duct on the fan outlet side must be
designed to ensure smooth and
undisturbed flow of the air; avoid, for
instance, sharp duct bends immediately
after the fan.
ACP and ACG fans are prepared for
circular duct connections on the outlet side.
Flanges supplied as standard comply with
EUROVENT 1/2.
Systems with a higher vibration level or
more exacting performance requirements
must be provided with expansion joints
between fan and duct, and ducts must not
be supported by the fan.
It is important to allow for free areas to
facilitate mounting and dismounting as
well as ordinary maintenance.
Fig. 4. Mounting foot for type ACP
Fig. 5. Mounting foot for types ACP and
ACG 250-1120
Fig. 6. Mounting foot for types ACP and
ACG 1250-1600
