Where to locate the fan.
Locate the fan where there is access from the ceiling for the ducting through the roof space and out
through the soffit see Fig. A for general installation arrangement.
At least 110mm from the edges of the mounting surface to the centre of the hole.
Fan to be located between joists.
Create easiest route for ducting with fewest bends and shortest length.
As far away as possible from and opposite to the main source of air replacement to ensure airflow across
the room (e.g. opposite the internal doorway).
Near the source of steam or odours.
Not where ambient temperatures are likely to exceed 50°C.
If installed in a kitchen fans must not be mounted immediately above a cooker hob, or eye level grill.
If installing in a room containing a fuel burning device which has a non-balanced flue, it is the
installer's responsibility to ensure that there is enough replacement air to prevent fumes being
drawn down the flue when the fan is operating up to maximum extract. Refer to Building Regulations
for specific requirements.
Exhaust air must not be discharged into a flue used for exhausting of fumes from appliances supplied
with energy other than electric. Requirements of all authorities concerned must be observed for
exhaust air discharge and intake flow rates.
Not suitable for use in possible chemical corrosive atmospheres.
What the installer will need.
3mm electrician’s screwdriver and No.1 or 2 Pozidrive screwdrivers.
Wiring and setting up
G
