Flueing Guidelines - Rinnai Neo RIB2311N Installation Manual

Flueing guidelines

Inbuilt masonry installations
Without flexiliner With flexiliner
Flueing notes
Every has fireplace requires a flue system that will draw effectively and clear flue products safely under all
potential wind and climatic conditions. It is the responsibility of the installer to ensure that the appliance is
provided with an effective flue. Some guidelines to assist with the flue design are listed below.
Flue cowl
An approved 100 mm cowl must be fitted
to all appliances.
Masonry installations
Rinnai strongly recommends the use of a
Rinnai flexiliner flue system (flexi Ø
100 mm). Failure to meet this criteria
may result in an unsafe situation.
Installation without a flexiliner flue is
permissible as long as the chimney is
sound and able to achieve a good draw.
Mock chimney installations
Natural draft flue.
For installations into a combustible
opening, a Rinnai zero clearance box and
flue kit are mandatory.
Flue dimensions; outer 150 mm, inner
100 mm.
Flue length and number of bends
- Minimum flue length
This is required to ensure adequate
draw and prevent spill-back of
combustion products which can
cause safety sensors to shut down
the unit.
Minimum flue length before and
bends or offsets—1.0 m.
Minimum vertical length—3.6 m.
Maximum flue length
-
Rinnai recommend a maximum of
8 m with a maximum of two 45 °
bends.
Inbuilt mock chimney installations
A = Direct flue (straight vertical) B = Offset flue
Clearance to combustibles
There must be a 25 mm clearance from the
inner flue to any combustible surface.
Flashings
Flashings to the top of the chimney
structure do not form part of the flue kit
and must be specified.
Flue cowl clearance
To ensure products of combustion are
cleared, adequate clearance from the
building is required.
The flue cowl should have a 500 mm
clearance from any part of the building.
This also applies to steeped and pitched
roofs, which should be clear of the ridge
line as shown. Lesser clearances may
provide perfectly adequate flue systems
depending on the installation.
Minimum clearances are shown in
AS/NZS 5601.1.
Flue cowl clearance—500 mm clearance from any part of the building
Freestanding installations
Self-supporting flue
The weight of the flue
system should not
be supported by the
appliance—it should
be self-supporting.
Supporting the flue is
usually completed during
the framing stage with
flue supports or straps
within the cavity.
Shared flues
Gas appliances must not be connected
to a chimney or flue serving a separate
fuel burning appliance.
Flue terminal locations
Must be compliant with the flue
terminal clearances as shown in
AS/NZS 5601.1. Flue is not to terminate
under floors or in a roof space.
Neo installation guide: 11906-F 06-14 | 13