A fan should always be sited in the furthest window
or wall from the main source of air replacement
to avoid short-circuiting the airflow.
It should be located as high as possible in the
window or wall nearest to smells or steam, but not
directly above eye-level grills or cooker hoods.
If the room contains a fuel
burning device (such as a gas boiler) with a non-balanced
flue, it is essential that there is enough replacement
air to prevent fumes being drawn down the flue
when the fan is extracting to its utmost capacity.
IEE Regulations (U.K.) require that a conventional
mains voltage fan in a bathroom or shower must
be located where it cannot be touched by a person
using the bath or shower and well away from any
Alternatively, the new TLC range of 12 volt S.E.L.V.
(Safety Extra Low Voltage) fans are specifically
designed for the safe ventilation of toilets,
bathrooms and shower rooms and can be fitted within
the splash area with absolutely no risk of electric
|Stale air is also removed
by installing the appropriate TLC fan.
In certain circumstances, such as in toilets, a
timer is incorporated to provide an automatic run-on
period of 15 minutes as stipulated in The Building
Ventilation units should be placed as high as possible
in the window or wall near any local smells and steam
but not directly above eye level grills, cookers or
direct sources of heat in excess of +40°C. Do not
sight in areas containing excessive levels of grease
without suitable filters.
In large rooms the
extract points should be well and safely distributed
to obtain even ventilation in all areas. A short circuit
of airflow will be avoided by siting units as far away
as practicable from the main source of air replacement.
Site the fan so that it is accessible for regular periodic
cleaning and servicing. Make sure that grilles, motor
cooling ports and impellers are able to function freely
in accordance with guarantee requirements.
Electrical equipment should be isolated
before carrying out any maintenance or cleaning. All
fans should be regularly cleaned and checked, (every
month or so, dependent on usage). Bearings should be
oiled where appropriate twice a year, unless stated
for more about ducting
Ducts passing through an unheated roof void should be
insulated to minimise condensate formation and must
include a condensation trap and a means of running off
Vertical ducts should be fitted with a condensation
trap and a weather proof
cowl of sufficient free area for the air volume. Horizontal
ducts should fall
away from the fan unit.
First check that there are no joists, pipes
or cables above the area where the fan will be located.
Ducting must be used when steam and or condensation
are likely to occur, unless venting directly to the
If installing in a position where condensation is likely
to run back towards the fan you will need to install
a condensation trap as near to the fan as possible.
If installing in an unheated roof void, ducting or soil
pipe should be insulated to minimise condensation forming.
Work out the route that the ducting will take and the
total length required. You will need an external grille
to match the ducting diameter.
These are pressure developing fans. This means they
are capable of overcoming the resistance encountered
in a ducted system. This is particularly useful in applications
such as internal toilets and bathrooms or washrooms
where there is no direct access to the outside.
Low Volt bathroom fans provide can be installed in complete
safety virtually anywhere in the bathroom. These fans
operate on 12 volts, ( transformer is required )
Check that your chosen location has no buried pipes
or cables, and that the wall outside is not obstructed
by a drain pipe.
It is advisable to have the hole pre cut
by a professional glazier.
NB Your glass supplier will provide you
with advice concerning the weight/type of glass necessary
for your specification, essential where fans are to
be installed in roof light situations.
The Xpelair range GX and DX models may
be installed in a hermetically sealed double glazing
system if a special sealed unit (with the correct size
hole pre-cut) is obtained from the double glazing manufacturer.
DX l 00 models will also require a double glazing kit,
Catalogue Reference XP DXDG.
For installing the GX models into
secondary glazing and casement windows use the double
window kit, XP GXDW