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TABLE 5. 7 VENTILATION FOR A REFRIGERATOR IN A SEALED RECESS

TABLE 5. 7 VENTILATION FOR A REFRIGERATOR IN A SEALED RECESS

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103

AS 5601 – 2000
AG 601 – 2000

5.13 FLUEING
5.13.1 General
5.13.1.1 Provision of a flue
Every appliance designed for connection to a flue shall be fitted with a flue in
accordance with this Standard, except where the Authority considers that, because
of ventilation or other factors, a flue is not required.

5.13.1.2 Flue installation not to reduce building strength or fire resistance
The design strength or fire resistance of a building shall not be reduced by the
installation of a flue .

5.13.2 Flue material
Material used in the construction of a flue shall comply with Table 3.2.

5.13.3 Flue design
5.13.3.1 General design requirements
The design of an open flue shall comply with Appendix H.

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NOTE: For flue systems not covered by Appendix H the Authority may require the design
of the system to be submitted prior to the commencement of any work.

5.13.3.2 Exhausting of flue gases
A flue or chimney shall be designed so that, under normal operating conditions of
the appliance , all flue gases are exhausted to outside atmosphere unless otherwise
specified in this Standard, or to an alternative location acceptable to the Authority.

5.13.3.3 Flue gases not to cause a nuisance
Where flue gases may enter a building or cause a nuisance to any person in the
vicinity, this shall be prevented.
NOTE: Means of prevention include flueing to above roof height, special selection of the
flue terminal and terminal location, and power flueing. Environmental authorities may
have additional requirements for such situations.

5.13.3.4 Vertical rise required before a change of direction
A flue fitted to an appliance that has an atmospheric burner shall be designed to run
vertically for the maximum possible distance before any change in direction unless
the appliance is designed and approved to accept a horizontal flue connection.

5.13.3.5 Lateral run in a flue
The length of a lateral run in a flue shall be as short as possible and not exceed
50% of the total flue height.

5.13.3.6 Minimum rise in a lateral run

ø

A lateral run of flue shall be designed to rise not less than 20 mm per 1 m run.
VIC 5.13.3.7 Appendix L

5.13.3.7 Common (combined) flue
Where more than one appliance is connected to a common flue, each appliance
shall have a flame safeguard system.

5.13.3.8 Flue for gas and other fuels
A flue shall not discharge into a flue concurrently flueing discharge from another
appliance fuelled by other than gas.

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AG 601 – 2000

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5.13.3.9 Restriction to the flow of the flue gases to be minimised
A flue shall comply with the following:
(a)

Changes of direction shall be kept to a minimum.

(b)

A change in direction, shape or size shall be gradual to minimise restriction to
the flow of flue gases.

5.13.3.10 Flue to include a draught diverter
The flue of an appliance shall include a draught diverter, except where any of the
following apply:
(a)

Where a draught diverter is an integral part of the appliance .

(b)

The appliance is a room-sealed type, an incinerator, or a pottery kiln.

(c)

The appliance is permitted by the Authority for installation under a ventilated
canopy or hood.

(d)

The appliance is designed to operate with a forced or induced draught burner.

(e)

The installation is permitted by the Authority for flueing into a room or
workspace.

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5.13.3.11 Operation of flue fitted with draught diverter
Where a draught diverter is fitted, the flue shall discharge the total flue gases at the
flue terminal without spillage from the draught diverter.

5.13.3.12 Operation of flue without a draught diverter
Where a draught diverter is not fitted, the following shall be provided where
applicable:
(a)

Means to prevent the discharge of flue gases to atmosphere other than at the
flue terminal, except where such discharge will not affect the operation of the
appliance and not be a hazard to persons or property.

(b)

Automatic shut-off of the main burner of an appliance designed to operate with
a forced or induced draught burner, where interruption to the normal free
discharge of flue gases at the flue terminal may be a hazard.

5.13.3.13 Power flue
Where satisfactory flueing relies on the operation of an extractor fan, the installation
shall include the following:
(a)

A sensing device fitted in the flue that will prevent the flow of gas to the
burner(s) when the fan is ineffective.
NOTE: Appliances with a permanent pilot need only be interlocked to cause the main
burner to shut off.

(b)

Each appliance is to be fitted with a safety shut-off system.

5.13.3.14 Flue cowl required
A flue cowl shall be fitted to the end of an open flue unless –
(a)

the flue is a power flue; or

(b)

the flue terminates in a roof space.

NOTE: Where a flue does not require a cowl to be fitted, consideration should be given to
minimising the possibility of rain or birds, etc, entering the flue.

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AS 5601 – 2000
AG 601 – 2000

5.13.4 Flue installation
5.13.4.1 Provision for removal of appliance
Where removal of an appliance requires the movement or displacement of the flue ,
the flue shall be installed so that such movement or displacement does not disturb
the roof seal or flashing.
NOTE: Provision of a slip socket or bolted sleeve at the appliance flue connection is an
acceptable method of connecting the flue to an appliance and satisfying this requirement.

5.13.4.2 Flue to be supported independently of appliance
A flue shall be supported independently of the appliance flue connection.

5.13.4.3 Support of flue
A flue shall be securely fixed and adequately supported by bracket(s) fastened to
the building structure at suitable points, to ensure the stability of the flue .

5.13.4.4 Soft-soldered flue joints
A flue with any soft-soldered joint shall be designed and supported to prevent stress
being imparted onto the soft-soldered joint.

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5.13.4.5 Joints in a flue
Flue joints shall be adequately sealed and comply with the following:
(a)

Where subjected to the weather, have downward facing sockets.

(b)

Where protected from the weather, have upward facing sockets.

5.13.4.6 Weather-proofing a flue pipe through a roof or wall
Where a flue passes through a roof or an external wall, the penetration shall be
made permanently weather-proof.

5.13.4.7 Brick or masonry flue to be sealed from cavities
A brick or masonry flue shall be completely sealed from all cavities.

5.13.4.8 Clearance around a draught diverter
There shall be at least 75 mm clearance between a draught diverter relief opening
and any wall surface.

5.13.5 Location of flue
5.13.5.1 Prohibited location of a flue
A flue shall not be located in, or through, lift wells, clothes chutes, rubbish chutes,
air ducts or ventilating ducts.

5.13.5.2 Concealed metal flue
Where part of a metal flue passes through an area where it is not readily
examinable, that part shall be –
(a)

metal sleeved;

(b)

twin wall flue; or

(c)

stainless steel or other corrosion resistant material.

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5.13.5.3 Flue pipe extending into a chimney
A flue pipe or spigot shall –
(a)

not extend so far into a chimney as to cause a restriction; and

(b)

be arranged to prevent any falling or loose material from entering or
obstructing the flue .

5.13.5.4 Temperature limitation of combustible surfaces near a flue or
chimney

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The clearance between a combustible surface and a flue or chimney shall be
sufficient to ensure the temperature of the combustible surface does not exceed
50°C above ambient.
NOTES:
1 This requirement also applies to a combustible surface near a flue or chimney which
is protected by a heat shield or fire resistant material.
2 Clause 5.13.5.7 details minimum clearances between approved twin wall metal flue
and combustible surfaces, Clause 5.13.5.8 details these clearances for single wall
metal or fibre cement flue. If the requirement of the applicable Clause is met the
intent of this Clause will be satisfied.
3 A flue or chimney constructed of materials other than those in Clauses 5.13.5.7 or
5.13.5.8 will need to be installed with sufficient clearance to ensure the temperature
limitation of this Clause is not exceeded. The Authority may require field testing or to
be supplied with information to confirm an installation of this type complies with this
requirement.

5.13.5.5 Clearance from wiring and fittings
The clearance between a flue and any electrical wiring or fitting, telephone cable or
communication wiring shall not be less than –
(a)

75 mm where the flue or appliance includes a draught diverter; or

(b)

150 mm where the flue or appliance does not include a draught diverter.

NOTE: This clearance may be reduced where the two are separated by thermal insulation
material.

5.13.5.6 Application of approved twin wall flue
Approved twin wall flue shall only be used as follows:
(a)

Where twin wall flue is used within a cavity wall in a domestic location, the
appliance gas consumption shall not exceed 50 MJ/h.

(b)

For appliances having a flue gas temperature of not more than 300°C.

NOTE: AGA approved appliances with a draught diverter will meet the maximum flue gas
temperature requirement.

5.13.5.7 Required clearance between an approved twin wall metal flue and
a combustible surface
The required clearance between an approved twin wall flue and a combustible
surface shall be at least 10 mm.
NOTE: The clearance is measured from the outer surface of the flue, (ie. not measured
from any spacers, which may touch the combustible surface).

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AS 5601 – 2000
AG 601 – 2000

5.13.5.8 Required clearance between a single wall metal or fibre cement
flue and a combustible surface
The required clearance between a single wall metal or fibre cement flue and a
combustible surface shall be at least that given in Table 5.8.

TABLE 5.8
REQUIRED CLEARANCE BETWEEN A SINGLE WALL METAL
OR FIBRE CEMENT FLUE AND A COMBUSTIBLE SURFACE
Clearance, minimum
mm
Application

State of combustible surface
Unprotected

Protected
(Note 1)

25 (Note 2)

25 (Note 2)

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Water heater, space heater or in built oven
with –
(a)

a flue not exceeding 150 mm ID

(b)

a flue exceeding 150 mm ID or a
rectangular flue other than in (c)

75

50

(c)

a flue 250 mm × 50 mm installed
on an outside wall

25 (Note 2)

25 (Note 2)

Incinerator – Not sanitary

450

300

Incinerator – Sanitary

75

50

Pottery kiln

600

450

Any other application

The clearance shall be sufficient to ensure the
temperature limitation of 50°C above ambient as
stated in Clause 5.13.5.4 is not exceeded

NOTES:
1

Clause 5.13.5.9 gives details of methods for the protection of combustible surfaces.

2

There is no reduction allowed in this clearance even where the combustible material is protected.

5.13.5.9 Protection of combustible surfaces
Where a combustible surface requires protection, to satisfy the requirement of
Clause 5.13.5.8, the method used shall provide protection at least equivalent to one
of the following:
(a)

Fire resistant material attached to the combustible surface and covered with
0.4 mm sheet metal.

(b)

Sheet metal having a minimum thickness of 0.4 mm sp aced out at least
25 mm from the combustible surface using non-combustible spacers.

(c)

Sleeving the flue with a duct of 0.4 mm sheet metal which has an air space
around the flue of at least 25 mm.

NOTE: See Figure 5.2 for details.

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AG 601 – 2000

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FIGURE 5.2 METHODS OF PROTECTING A COMBUSTIBLE SURFACE
Method (a)

Method (b)

Method (c)
25 mm space

Flue

Flue

Flue

Sheet metal
(0.4 mm)
Minimum

Sheet metal
(0.4 mm)
clearance

Minimum

clearance
Minimum

25 mm

Combustible material

clearance

space

Combustible material

Combustible material

Fire resistant material
(Minimum thickness 6 mm)

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5.13.5.10 Protection of adjacent non-combustible materials from heat of
flue
Where a flue is fitted within a wall or partition made of non-combustible material,
provision shall be made to prevent the temperature of the wall or partition external
surfaces exceeding 50°C above ambient.
NOTE: This requirement is to protect materials on or near the external surface of the wall
or partition.

5.13.6 Terminating a flue – Location
NOTE: For the location of a flue terminal on a caravan or marine craft refer to
Clause 6.2.6.5 or 6.3.6.7 as appropriate.

5.13.6.1 The termination point
downdraught

of

a flue to be

located

to avoid

The termination point of a flue shall be so located in relation to neighbouring
structures that wind from any direction will not be likely to create downdraught in
the flue or chimney.

5.13.6.2 Terminating a flue above a roof
Where a flue is to terminate above –
(a)

a roof, the end of the flue shall be at least 500 mm from the nearest part of the
roof;

(b)

a trafficable roof designed for personal or public use, the end of the flue shall
be at least 2 m above the roof level. This dimension is to be increased where
necessary so that a minimum distance of 500 mm is maintained above any
surrounding parapet; or

(c)

a chimney, the end of the flue shall be at least 200 mm from the nearest part
of the chimney.

NOTES:
1 This distance is measured before the cowl (if required) is fitted to the end of the flue.
2 In respect to a roof, the distance may not apply where the flue is equipped with a
device, acceptable to the Authority, which will ensure effective flueing is achieved
with a lesser clearance to the roof.
3 This Clause does not apply in situations covered by Clause 5.13.6.5.

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