Installation Supplement

Constructing the Chamber
The chamber can be constructed from masonry or insulated fireproof
boards. There should be no combustible material within the chamber and
all chamber materials need to be non-combustible. The recommended
material for constructing the chamber is Thermalux board as it is both
non combustible and has a high insulation value and, because it is self-
supporting, there is no need for studwork, fixings etc.
The chamber needs to be closed off at the top. This makes certain that
no heat can escape upwards and ensures that the stove is separate from
any joists, floorboards etc.
The flue should pass through the chamber ceiling as a good fit before it
connects to a pumice chimney or a flexible liner in a masonry chimney. If
a pre-fabricated insulated stainless steel chimney is used then the void
between the top of the chamber and the floor above also needs to be
ventilated.
If it is required to duct warmth to other rooms then either ducting spigots
can be fitted to the top sheet of Thermalux or a steel ducting plate can
be used (for the Stella models). This has either two or four duct spigots.
The insulated ducting connects to these and fits to grille backplates at
the other end. The Ulys models have duct spigots built into the top of the
body and the ducting then goes from those, through the Thermalux top
sheet and to the grilles positioned in other rooms.
The front is usually closed off using Thermalux board and the frame fixed
in place.
Venting the chamber
A stove chamber should always be vented, with the lower vents close to
the floor and the outlet vents close to the top of the chamber.
Vents can be positioned on one or both sides of the chamber or on the
front. If there is to be a wood store below the appliance then the inlet
convection air can brought in through that. Air from the chamber can
also be vented directly into the room behind the appliance or into a room
or hallway above.
With insert stoves the majority of the heat is released as convected
warmth and so the larger the vents, the quicker and further the warmth
is spread. The warm air can also be ducted from the chamber to other
parts of the house. Bear in mind that warm air will easily travel upwards
or at an angle and will also travel horizontally, especially if there has
been a vertical rise first, but long horizontal runs will reduce the amount
of ducted air that will be released.
With a dry stove the vent size is dependent of the output of the stove.