Ventilation
Requirements
Building Regulations document J states
that purpose provided permanent
ventilation is not required in England
and Wales unless the appliance nominal
rated output is greater than 5kW.
The Neo-eco range of stoves have a
nominal output of 5Kw and therefore do
not require additional ventilation, unless:
• The air permeability of the building is
less than 5.0m³/ (h.m²), then 550mm
of permanent ventilation/Kw of the
nominal output is required as per
Building Regulations document J.
• If the appliance is installed into or
adjacent to, a room containing an
extractor fan then additional testing
and ventilation is required in line with
Approved Document (A.D.) 1.21
If difficulty in starting the fire or any
excessive fuming is experienced,
ventilation may be used 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 which often require
purpose provided ventilation be added.
Outside direct combustible air
connection
The Neo-Eco range of stoves are
supplied with the ability of using a
dedicated 100mm diameter direct
connection duct through a suitable route
to the outside air. It can be connected to
the underside of the stove and should
be fitted at the time of stove installation.
Only the approved kit for ACR stoves
should be used (DA100)
This is designed to supply all the
necessary air(Primary, Secondary and
Tertiary) for safe combustion and
operation of the stove.
Providing there is no depressurisation of
the property by mechanical or other
types of ventilation, the flue, chimney
and ventilation duct are working
correctly, and properly maintained clear
of obstructions or leaks etc.
The kit supplies all the primary,
secondary and tertiary air to the stove
and may be used where mechanical
ventilation and heat recovery (MVHR)
units are used.
Some additional instructions for
installation are provided with the
dedicated kit supplied.
NOTE: in order to register the
installation with HETAS/Building
Control as of 2016 certain extra
testing and certification is required
if using an outside air connection.
Flue Draft
A flue draught at the flue collar of the
appliance with a minimum reading of
2.2mm to a maximum 3.5mm water
gauge (22 to 35 Pascals) is required for
satisfactory appliance performance.
This relates to 12-25 Pascals at the
tapping on EN13240/13229 test rigs
which is often quoted.
The Neo-Eco range requires a minimum
of 12Pa within 3 minutes of ignition (with
the stove door closed) for correct
combustion.
The flue draught should be checked
under fire at start up and high output, if
the values fall outside of the stated
parameters then remedial works should
be carried out.
If it greatly exceeds the recommended
maximum, a draught stabiliser must be
fitted in line with building control
document J so that the rate of burning
can be controlled to prevent overfiring.
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