Connection To Chimney; Rear Connection; Combustion Air Supply - Contura i41 Installation Instruction

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Connection to chimney

• The insert must be connected to a chimney designed to withstand flue gas
temperatures of up to 400°C.
• The external diameter of the connection sleeve is 150 mm.
• In normal operating mode, draft in the chimney should be 20-25 Pa close to
the connection sleeve. The draft is affected primarily by the length and area
of the chimney and also by how well sealed it is. The recommended minimum
flue length is 3.5 m and its diameter should be Ø130 to Ø150 mm.
• Sharp bends and horizontal lengths in a flue pipe reduce the draft in
the chimney. The maximum horizontal length of flue pipe allowed is 1 m,
provided the flue pipe rises vertically for at least 5 m.
• It must be possible to sweep the full length of the flue, and the soot doors
must be easily accessible.
• Carefully check that the chimney is sealed and that there is no leakage
of smoke from the soot doors or connections.

Rear connection

If connecting at the rear, we recommend using a 45° +45° angle with a soot
hatch and with the centre 285 mm above the sleeve.
Note that if connecting at the rear, a heat deflector or protective screen must
be installed before the chimney is connected.

Combustion air supply

When an insert is installed, the need for an adequate supply of air to the room increases. Air can be provided indirectly via a vent in the outer wall or via a
duct from the outside that connects to the sleeve on the underside of the insert. The required volume of combustion air is about 25 m
The outer diameter of the combustion air connection sleeve is 100 mm.
In heated spaces, the flue must be insulated to prevent condensation using 30 mm mineral wool covered with a vapour barrier. The hole in the wall (or floor)
at the exit point must be properly sealed with flue jointing compound.
A 1-metre combustion-air tube insulated to prevent condensation is available as an optional extra.
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