Unovent h-line Installation Manual
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Dwelling
Moisture
Management
Installation Guide for Unovent® h-line™
system, including the Unobrain® install-
and-forget, fully automated controller.
These guidelines have the
purpose of helping the
experienced and inexperienced
manage the task of installing the
Unovent® h-line™ system for
rooms with no roof cavity above
including the fully automatic,
install-and-forget Unobrain® for managing the system when
the outside source air temperature and/or humidity makes this
resource unsuitable for short periods.
Please read this entire document thoroughly before
commencing the installation.
For the cable supplied, it is essential that the cable core
marked red or white is always fitted to the plug and
socket connectors marked with a red stripe.
All product and component photos within this guide are for
illustrative purposes only and colours, shapes and
components used in the supplied product may change at any
time but retain the same or improved functionality of the items
illustrated.
Version H180917
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1. Installation of Unovent® h-line™ system for rooms with no
roof cavity requires a degree of skill and experience to
ensure no damage is done to existing wall framing and
electrical power cables. It is the responsibility of the
installer and the home owner to ensure correct
procedures are followed when installing any through-thewall device and to ensure that the finished installation
does not allow the ingress of water into the external wall
structures. If uncertain about the critical requirements
when installing devices which penetrate external walls, do
not attempt such work until that uncertainty is removed.
Alternatively, utilise the services of a qualified trades
person who understands the requirements to prevent
ingress of water into the external wall structures.
(Unovent Limited does not take any responsibility for the
finished water tightness or otherwise for the installation.)
2. Decide where you plan to install the outer wall mounted
Unovent® room outlets in each room selected. These
should be living spaces, such as bedrooms, lounges,
family rooms and dining rooms.
3. The first stage of this planning is to simply decide on the
preferred locations where the 240mm holes are to be cut
in the wall lining for mounting the Unovent® room outlets.
Do not actually start cutting holes at this point – that will
be described later in this instruction.
4. For the bedrooms, lounge rooms, family rooms and dining
rooms, select the position on the wall near the window
and the ceiling where you expect the hole to be cut to take
the Unovent® room outlet.
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5. These ideal or planned positions should be written into a
note pad to avoid confusion but translated and noted as
distances from the edge of the window or similar. This is
because the final positions of Unovent® room outlets
must be determined by next checking both inside the
room and outside of the house at the outer cladding for
positions which will not interfere with wall framing. A stud
finder could prove useful in determining positions clear of
timber framing.
6. When all locations have been determined, with a high
degree of confidence, an extra length drill could be used
to drill a centre position through both the internal lining
and the external cladding (if the latter is timber or fibrous
plaster). In the case of a brick veneer external cladding,
the same approach could be taken with an extra-long
masonry drill to create a hole through the brick cladding
which will be the centre point of the Unovent® room
outlet.
7. Be mindful of ensuring that any timber framing is avoided
when determining the centre points for the Unovent®
room outlets and check carefully that no existing electrical
power cables will be cut during this and subsequent
installation steps.
8. The hole cut size diameter for the internal lining of the
room for the Unovent® room outlets is 240 mm (120 mm
radius). If the external cladding is timber or fibrous
plaster, it is likely that the overall wall thickness will be
approximately 140 mm. This means that the hole in the
outer cladding will need to allow for a diameter of 170 mm
(85 mm radius) to take the fan housing section of the
Unovent® room outlet. If the external cladding is brick, it
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is likely that the overall wall
thickness will be
approximately 250 mm,
which includes the 50 mm
cavity between the brick
and the wall framing. This
means that the hole in the
outer brick cladding will
need to allow for a diameter of 110 mm (55 mm radius) to
take the inlet tube section of the Unovent® room outlet.
9. The Unovent® h-line™ room outlets are supplied with an
inlet tube section which is cut to length to suit the overall
wall thickness (from the internal lining visible face through
to the face of the external cladding). For thinner overall
wall thicknesses, this inlet tube section should not be cut
to less than 25 mm from the edge of the plastic weld
connecting this inlet tube section to the fan housing.
10. When all the holes have been cut in the walls for each
room, lengths of the cable supplied should be placed from
one hole to the next hole, then from that second hole to
the third and so on, all ends loosely hanging inside the
rooms but placed along the shortest path so as not to
waste the cable. These ends will ultimately be connected
to the Unovent® room outlets utilising the plugs on the
Unovent® room outlets and the sockets supplied for the
cables. Finally a run of cable should be placed from the
nearest cut hole (with 300mm to 400mm hanging out of
the hole) to the place where the Unobrain® will be located
outside under the eave or on the ceiling of an entrance
porch or doorway. This is to ensure that the Unobrain®
can sense the condition of the outside air to then leave the
system running or to switch it off when the air outside is
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