5
Juno & Vulcan
Issue 01 06/13
fuel compatible prefabricated block chimney or a twin-walled insulated stainless steel
flue to BS 4543 can be used. These chimneys must be fitted in accordance with the
manufacturer’s instructions and Building Regulations.
4.2 Ventilation
Purpose provided ventilation is not required in England and Wales unless the appliance
nominal rated output is greater than 5kW. Over 5kW 5.5 cm
2
of ventilation (550mm
2
) is
required for every kW output above 5. For example 6.5 kW requires 8.25 cm
2
and 8 kW
needs 16.5cm
2
. In any case, if difficulty in starting the fire or any fuming is experienced,
ventilation must be put in place as required to eliminate these flue problems. If a flue
draught stabiliser is fitted then extra ventilation is required. See Document J of the
Building Regulations for detailed guidance especially in new build properties.
4.3 Flue Draught
A flue draught of minimum 1.2mm to a maximum 2.5mm water gauge (12 to 25 Pascals)
is required for satisfactory appliance performance. The flue draught should be checked
under fire at high output and, if it exceeds the recommended maximum, a draught
stabiliser must be fitted so that the rate of burning can be controlled to prevent over-
firing.
4.4 Connection to the Chimney
This appliance is
not
suitable for use in a shared flue.
When using a liner a 5” flexible flue liner is permitted be used on these models ONLY
providing that they only burn smokeless fuel or seasoned wood logs with the air limiter
fitted in in full accordance with the wood burning instructions.
An existing fireplace opening can be bricked up or sealed with a register plate. A short
length of flue pipe of a minimum 125mm internal diameter (150mm min where the flue
spigot socket is 150mm diameter) may then be used to connect the stove to the
chimney. A maximum of 150mm horizontal flue pipe can be used. This flue pipe should
conform to Building Regulations. Ensure that the pipe end is no closer than 76mm to the
side or rear chimney walls.
Ideally, the old fireplace should be filled in so that there is a smooth streamlined entry
into the flue way. It is essential that all connections between the stove and chimney-flue
are sealed and made airtight with sealing rope, clamping rings and/or fire cement or
heat resisting cement where required.
Both the chimney and flue pipe must be accessible for cleaning and if ANY parts of the
chimney cannot be reached through the stove (with baffle removed), a soot door must
be fitted in a suitable position to enable this to be done.
