G4 Ventilation 3rd Edition Amendment 2

7/27/2019 G4 Ventilation 3rd Edition Amendment 2

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Copiance Docuent orNew Zeaand Buiding CodeCause G4Ventiation Third EditionPrepared by the Departent o Buiding and Housing

This Copiance Docuent is prepared by the Departent o Buiding

and Housing. The Departent o Buiding and Housing is a Governent

Departent estabished under the State Sector Act 1988.

Enquiries about the content o this docuent shoud be directed to:

Departent o Buiding and Housing

PO Box 10-729, Weington.

Teephone 0800 242 243

Fax 04 494 0290

Eai: [email protected]

Compliance Documents are available rom www.dbh.govt.nz

Departent o Buiding and Housing 2011

This Copiance Docuent is protected by Crown copyright, uness indicated otherwise.

The Departent o Buiding and Housing adinisters the copyright in this docuent.

You ay use and reproduce this docuent or your persona use or or the purposes

o your business provided you reproduce the docuent accuratey and not in an

inappropriate or iseading context. You ay not distribute this docuent to others

or reproduce it or sae or proit.

The Departent o Buiding and Housing owns or has icences to use a iages and

tradearks in this docuent. You ust not use or reproduce iages and tradearks

eatured in this docuent or any purpose (except as part o an accurate reproduction

o this docuent) uness you irst obtain the written perission o the Departent

o Buiding and Housing.


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Document Status

The ost recent version o this docuent, as detaied in the Docuent History, is approved by the Chie Executive

o the Departent o Buiding and Housing. It is eective ro 10 October 2011 and supersedes a previous versions

o this docuent.

Peope using this Copiance Docuent shoud check or aendents on a reguar basis. The Departent o Buiding

and Housing ay aend any part o any Copiance Docuent at any tie. Up-to-date versions o Copiance

Docuents are avaiabe ro www.dbh.govt.nz

Status o Compliance Documents

Copiance Docuents are prepared by the Departent o Buiding and Housing in accordance with section 22 o the

Buiding Act 2004. A Copiance Docuent is or use in estabishing copiance with the New Zeaand Buiding Code.

A person who copies with a Copiance Docuent wi be treated as having copied with the provisions o the Buiding

Code to which the Copiance Docuent reates. However, a Copiance Docuent is ony one ethod o copying with

the Buiding Code. There ay be aternative ways to copy.

Users shoud ake theseves aiiar with the preace to the New Zeaand Buiding Code Handbook, which describes

the status o Copiance Docuents and expains aternative ethods o achieving copiance.

Dened words (itaicised in the text) and cassied uses are expained in Causes A1 and A2 o the Buiding Code and in the

Denitions at the start o this Copiance Docuent.

G4: Document History

Date Alterations

First pubished Juy 1992

Aendent 1 Septeber 1993 p. 3, 1.1.2

Reprinted

incorporating

Aendent 1

Juy 1994

Second edition 28 February 1998 Docuent revised second edition issued

Aendent 1 23 June 2007 p. 2, Docuent History, Status

p.5, Contents

p.7, Reerences

p.9, Denitions

pp. 1316 G4/AS1

Third edition 1 Noveber 2008 Docuent revised third edition issued

Aendent 2 10 October 2011 p. 2, Docuent History, Status

p.7, Reerences

Note: Page numbers relate to the document at the time o Amendment and may not match page numbers in current document.


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New Zeaand Buiding Code

Cause G4 VentiationThis Cause is extracted ro the New Zeaand Buiding Code contained in the First Schedue

o the Buiding Reguations 1992 and aended by the Buiding Aendent Reguations 1997.

FIRST SCHEDULEcontinued

Clause G4VENTILATION

Provisions

ObjECTIVEG4.1Theobjectiveothisprovisionistosaeguardpeopleromillnessorlossoamenitydue

tolackoreshair.

FUNCTIONAL REqUIREmENT

G4.2Spaceswithinbuildingsshallbeprovidedwithadequateventilationconsistentwiththeirmaximumoccupancyandtheirintendeduse.

PERFORmANCEG4.3.1Spaceswithinbuildingsshallhavemeansoventilationwithoutdoor airthatwillprovideanadequatenumberoairchangestomaintainairpurity.

G4.3.2Mechanicalair-handlingsystemsshallbeconstructedandmaintainedinamannerthat

preventsharmulbacteria,pathogensandallergensrommultiplyingwithinthem.

G4.3.3Buildingsshallhaveameansocollectingorotherwiseremovingtheollowingproductsromthespacesinwhichtheyaregenerated:

(a)Cookingumesandodours,

(b)Moistureromlaundering,utensilwashing,bathingandshowering,

(c)Odoursromsanitaryand

wastestoragespaces,

(d)Gaseousby-productsandexcessivemoistureromcommercialorindustrialprocesses,

(e)Poisonousumesandgases,

()Flammableumesandgases,

(g)Airborneparticles,

(h)Bacteria,virusesorotherpathogens,or

(i) Productsocombustion.

Liits on application

D E P A R T m E N T O F B U I l D I N G A N D H O U S I N G 1 N o v e m b e r 2 0 0 8

V E N T I L A T I O NClause G4


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V E N T I L A T I O N Clause G4

1 N o v e m b e r 2 0 0 8 D E P A R T m E N T O F B U I l D I N G A N D H O U S I N G

FIRST SCHEDULEcontinued

Provisions

G4.3.4Contaminatedairshallbe

disposedoinawaywhichavoidscreatinganuisanceorhazardtopeopleandother property.

G4.3.5Thequantitiesoairsuppliedorventilationshallmeettheadditionaldemandsoanyfxedcombustion appliances.

Liits on application


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D E P A R T m E N T O F B U I l D I N G A N D H O U S I N G

V E N T I L A T I O NContents G4/VM1 & AS1

1 N o v e m b e r 2 0 0 8

Contents Page

Reerences 7

Defnitions 9

Verifcation Method G4/VM1 11

1.0 Ventilation Rate 11

2.0 Air Purity 11

Acceptable Solution G4/AS1 13

1.0 Ventilation 13

1.1 Introduction 13

1.2 Natura ventiation Genera 13

1.3 Natura ventiation o both househod 13

units and accoodation units

with one externa wa1.4 Cobined natura ventiation and 17

echanica ventiation

1.5 mechanica ventiation 18

2.0 Ventilation o Spaces Containing

Gas-uel Appliances 19

2.1 Natura ventiation 19

2.2 mechanica ventiation 19

2.3 Fue construction 19

2.4 Fue ocations on dweings 20

3.0 Another Solution or Gas-uel

Appliances 20

Appendix 1 Typical apartment layouts 21

and ventilation options

Index 25


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ReerencesFor the purposes o New Zeaand Buiding Code (NZBC) copiance, the Standards and

docuents reerenced in this Copiance Docuent (priary reerence docuents) ust be

the editions, aong with their speciic aendents, isted beow. Where these priary reerence

docuents reer to other Standards or docuents (secondary reerence docuents), which

in turn ay aso reer to other Standards or docuents, and so on (ower-order reerence

docuents), then the version in eect at the date o pubication o this Copiance Docuent

ust be used.

Where quoted

Standards New Zealand

AS/NZS 3666: Air-handing and water systes o buidings

microbia contro

Part 1: 2002 Design, instaation and coissioning AS1 1.5.1 b)

Part 2: 2002 Operation and aintenance AS1 1.5.1 b)

NZS 4303: 1990 Ventiation or acceptabe indoor air quaity AS1 1.5.1 a) d)

AS/NZS 4740: 2000 Natura ventiators Cassication and perorance AS1 1.3.7 c)

NZS 5261: 2003 The instaation o gas burning appiances and AS1 2.3.1 b), 2.4.1 c),

equipent 3.0.1

Amends: 1, 2

Standards Australia

AS 1668: The use o echanica ventiation and air-conditioning

in buidings

Part 2: 2002 Ventiation design or indoor-air containant contro AS1 1.2.4, 1.3.7 d)

Amends: 1, 2 1.5.1 a) c) i) ii) d)

e), ), g),

New Zealand Government Departments

Departent o labour (Occupationa Saety and Heath) Workpace Vm1 2.0.1

exposure standards and bioogica exposure indices or

New Zeaand 1992

Chartered Institution o Building Services Engineers, London

CIBSE Code Series A: 1996 Air distribution systes Vm1 1.0.1,

AS1 1.5.1 h)


V E N T I L A T I O NReerences G4/VM1 & AS1

1 0 O c t o b e r 2 0 1 1

Aend 2Oct 2011

Aend 2Oct 2011

Aend 2

Oct 2011


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1 N o v e m b e r 2 0 0 8


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V E N T I L A T I O NDe in it ions G4/VM1 & AS1

1 N o v e m b e r 2 0 0 8

DenitionsThis is an abbreviated ist o denitions or words or ters particuary reevant to this Copiance

Docuent. The denitions or any other itaicised words ay be ound in the New Zeaand Buiding

Code Handbook.

Adequate Adequate to achieve the objectives

o the Building Code.

Atmospheric burner A burner syste where

a the air or cobustion is induced by the

inspirating eect o a gas injector and/or by

natura draught in the cobustion chaber

without echanica assistance.

Building has the eaning ascribed to it by

sections 8 and 9 o the Buiding Act 2004.

Building element Any structura and

non-structura coponent or asseby

incorporated into or associated with a

building. Incuded are xtures, services,

drains, peranent echanica instaations

or access, gazing, partitions, ceiings and

teporary supports.

Chimney A non-cobustibe structure which

encoses one or ore fues, repaces or

other heating appiances.

Common extract duct A echanica

ventiation duct that extracts ro dierent

household units, and ay contain air,oisture and containant.

Construct In reation to a building, incudes

to design, buid, erect, preabricate and

reocate the building.

Draught diverter A device, without oving

parts, tted in the fueo an appiance or

isoating the cobustion syste ro the

eects o pressure changes in the

secondary fue.

Equivalent aerodynamic area The area oan equivaent aerodynaicay perect orice,

and equas the penetration area required by

the natura ventiation device utipied by

the discharge coecient deterined

under test.

Fire separation Any buildingelementwhich

separates recellsor recellsand sae paths,

and provides a specic re resistance rating.

Fixture An artice intended to reain

peranenty attached to and or part

o a building.

Flue The passage through which the products

o cobustion are conveyed to the outside.

Forced or induced draught appliance

An appiance where a or part o the air or

cobustion is provided by a an or other

echanica device which is an integra part

o the cobustion syste.

Habitable space A space used or activities

noray associated with doestic iving,

but excudes any bathroo, aundry, water

coset, pantry, wak-in wardrobe, corridor,

haway, obby, cothes-drying roo, or other

space o a speciaised nature occupied

neither requenty nor or extended periods.

Household unit

a) eans any buildingor group o buildings,

or part o a buildingor group o buildings,

that is:

i) used, or intended to be used, ony orainy or residentia purposes; and

ii) occupied, or intended to be occupied,

excusivey as the hoe or residence

o not ore than one househod; but

b) does not incude a hoste, boarding house

or other speciaised accoodation.

Intended use in reation to a building:

a) incudes any or a o the oowing:

i) any reasonaby oreseeabe occasionaother use that is not incopatibe with

the intended use; and

ii) nora aintenance; and

iii) activities taken in response to re or

any other reasonaby oreseeabe

eergency

b) but does not incude any other

aintenance and repairs or rebuiding.


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V E N T I L A T I O N De in i t ions G4/VM1 & AS1

D E P A R T m E N T O F B U I l D I N G A N D H O U S I N G10

1 N o v e m b e r 2 0 0 8 10

Natural draught The fow produced by the

tendency o wared gases to rise.

Net openable area is the area o windows

or doors or other opening easured on the

ace diensions o the openabe buildingelementconcerned.

Occupied space Any space within a building

in which a person wi be present ro tie

to tie during the intended useo the

building.

Outdoor air Air as typicay coprising by

voue:

i) oxygen 20.94%

ii) carbon dioxide 0.03%

iii) nitrogen and other inert gases 79.03%.

Passive stack ventilator A syste incuding

a ventiation shat which uses natura draught

to ventiate spaces.

Permanent opening An opening which cannot

be cosed, this ipies that doors, windows

etc are NOT peranent openings, athough

door undercuts are.

Room-sealed appliance An appiance

designed so that air or cobustion neither

enters ro, nor cobustion products enter

into, the roo in which the appiance is

ocated.

Trickle ventilator A controabe ventiation

opening through the externa enveope to

the outside to provide background ventiation.


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V E N T I L A T I O NVeri icat ion Method G4/VM1

111 N o v e m b e r 2 0 0 8

Verication method G4/Vm11.0 Ventilation Rate

1.0.1 In ducted echanica ventiation systes

the air-fow rate (and consequenty nuber o

air changes), ay be veried using the

ethods o easureent given in the CIBSE

Code Series A, Appendix A3.1. For

deterining the voue o outdoor air,

easureents sha be taken cose to the

outdoor airinet.

2.0 Air Purity

2.0.1 The acceptabiity o indoor air purity or

workpaces ay be veried by deonstrating

that containant eves do not exceed the

iits recoended in Workpace Exposure

Standards and Bioogica Exposure Indices or

New Zeaand 1992.


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1 N o v e m b e r 2 0 0 8 1212


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V E N T I L A T I O NAcceptable Solut ion G4/AS1

1

Acceptabe Soution G4/AS11.0 Ventilation

1.1 Introduction

1.1.1 Ventiation o spaces within buildings

is required to aintain air purity by a fowo outdoor airthrough the buildingenveope,

with or without echanica assistance.

1.1.2 Ventiation o spaces within buildings

ust be provided by natura ventiation (reer toParagraphs 1.2 and 1.3), echanica ventiation

(reer to Paragraph 1.5), or a cobination o

echanica and natura ventiation (reer to

Paragraph 1.4).

1.1.3Buildingscontaining Type 5 re aar

systes ust have echanica extract

ventiation instaed in kitchens.

1.2 Natural ventilation General

1.2.1 Where natura ventiation is avaiabe

via adjacent spaces, specic ventiation is

not required to sa spaces such as haways

and obbies in household units.

1.2.2 Natura ventiation o occupied spaces

ust be achieved by providing a net openable

areao windows or other openings to the

outside o no ess than 5% o the foor area.

The 5% foor area requireent does not appy to:

a) occupied spacesin Coercia and

Industria buildingswhere products isted

in NZBC Cause G4.3.3 are generated

(echanica ventiation o these spaces

is required), and

b) household unitsand accoodation units

where there is ony one externa wa with

opening windows (reer to Paragraph 1.3 or

additiona requireents i natura ventiationis used).

1.2.3 Openabe building elementssha be

constructed in a way that aows the to reain

xed in the open position as a eans o ventiation

during nora occupancy o the building.

1.2.4 Natura ventiation o car parks shacopy with the natura ventiation part o

AS 1668.2 Section 7.

1.3 Natural ventilation o household

units and accommodation units

with one external wall

Scope

1.3.1 Paragraphs 1.3.2 to 1.3.9 speciy the

natura ventiation to both household unitsand

accoodation units with ony one externa

wa, such as those oten ound in apartents,hotes and otes.

Kitchens, bathrooms, toilets and laundries

that have an external wall

1.3.2 For kitchens, bathroos, toiets and

aundries ocated on the externa wa, oisture

and other containants ust be ventiated to

the outside by natura ventiation using either:

a) windows and/or other openings to the

outside with a net openable areao no essthan 5% o the foor area, or

b) high eve trickle ventilatorsocated through

the externa wa or building elementswithin

the externa wa (see Paragraph 1.3.9 or

trickleventilators), where the distance

between the externa wa and opposing

wa is ess than 6 etres.

COMMENT:

I activities or environenta conditions adjacent

to externa natura ventiation openings produce air

poution in any o the ors isted in NZBC G4.3.3,

it ay be necessary to reocate the openings or use

echanica ventiation.

COMMENT:

Reer to Copiance Docuents F7 Warning Systes

F7/AS1 and C Fire Saety C/AS1 Appendix A or

inoration on Type 5 ire aars.

COMMENT:

1. The net openabe area o windows or doors is

easured on the ace diensions o the building

elementconcerned.

2. Fixing in an open position o doors and windows

used or ventiation is necessary to avoid injury or

daage ro sudden cosure in the event o strong

winds or other orces.

3. Keeping water ro entering the buildingust be

considered or copiance with NZBC Cause E2

Externa moisture.


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V E N T I L A T I O N Acceptable Solut ion G4/AS1

1 N o v e m b e r 2 0 0 8 D E P A R T m E N T O F B U I l D I N G A N D H O U S I N G1

Kitchens, bathrooms, toilets and laundries

without an external wall

1.3.3 For kitchens, bathroos, toiets and

aundries not ocated on the externa wa,

oisture and other containants ust beventiated to the outside by natura ventiation

having:

a) a passive stack ventilator, ocated in the

kitchen, bathroo, toiet or aundry, designed

to extract a continuous airfow through the

surrounding habitable spaces(see Paragraph

1.3.7 or passive stack ventilators), and

b) high eve trickle ventilators, ocated within

the externa wa or in building elementsthat

are integrated within the externa wa (see

Paragraph 1.3.9 or trickle ventilators), and

c) permanent openingsor airfow between

the surrounding habitable spacesand the

kitchen, bathroo, toiet or aundry o no

ess than 5% o the cobined foor area

o the spaces, and not coproising the

privacy o the toiet or bathroo, and

d) a cobined distance o the habitable space

and the kitchen, bathroo, toiet or aundry

easured between the externa wa and

urthest opposing wa o ess than

10 etres.

Habitable spaces that have an external wall

and open to a kitchen, bathroom, toilet or

laundry with a passive stack ventilator

1.3.4 For habitable spaceswith both an externa

wa and a permanent openingto a kitchen,

bathroo, toiet or aundry, ventiation sha be

achieved by:

a) instaing high eve trickle ventilators, ocatedwithin the externa wa or building elements

within the externa wa (see Paragraph 1.3.9

or trickle ventilators), and

b) having a passive stack ventilatorinstaed in

the kitchen, bathroo, toiet or aundry, and

c) having an area o permanent opening

between the two spaces o no ess than 5%

o the cobined foor area o the habitable

spaceand the kitchen, bathroo, toiet or

aundry, and not coproising the privacy

o the toiet or bathroo, and

d) windows and/or other openings to the

outside with an net openable areao no

ess than 5% o the foor area, and

e) having a axiu diension between

the externa wa and the urthest interna

opposing wa, when easured across the

cobined habitabe space and the kitchen,

bathroo, toiet, or aundry, o ess than

10 etres.

Habitable spaces that have an external wall

and do not open to a kitchen, bathroom,

toilet or laundry with a passive stack

ventilator

1.3.5 For habitable spaceswith an externa wa

and no permanent openingto surrounding

spaces, ventiation ust be achieved by having:

a) windows and/or other openings to the

outside with an net openable areao no

ess than 5% o the foor area, and

b) high eve trickle ventilators, ocated within

the externa wa or in building elements

within the externa wa (see Paragraph 1.3.9

or trickle ventilators), and

c) a distance between the externa wa and

opposing wa o the habitable spaceso

ess than 6 etres.

Habitable spaces ventilated via another

habitable space1.3.6 Ventiation o a habitable spacewithout

openings to the exterior via another habitable

spaceust be achieved by:

a) providing ro the other habitable space

to outside, openabe windows and/or other

openings o net openable areao no ess

than 5% o the cobined foor area o the

cobined habitable spaces, and


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1

b) providing high and ow eve trickle ventilators

ocated on the externa wa (see Paragraph

1.3.9 or trickle ventilators), sized according

to the cobined foor area, and

c) providing an area o permanent openingbetween the two spaces o no ess than

5% o the cobined foor area o the

habitable spaces, and

d) having a cobined distance o the habitable

spaces, easured between the externa

wa and urthest opposing wa, o ess

than 6 etres.

Passive stack ventilators

1.3.7Passive stack ventilatorsconsist o a verticaventiation shat which uses air buoyancy to

ventiate spaces. Passive stack ventilatorssha:

a) have no connections ro spaces other than

kitchens connecting to the kitchen passive

stack ventilator, and

b) not be used in household unitsin cobination

with echanica ventiation systes, and

c) be designed in accordance with

AS/NZS 4740 Section 3, and

d) be designed to achieve extract airfow ratesspecied in AS 1668.2 Tabe B1, using the

oowing paraeters:

Air Density r = 1.2 kg/

Gravitationa Constant g= 9.81 /s

Teperature Dierentia DT= 3K

Outside Abient Teperature T= 300K

Wind Veocity Vt = 0/s, ande) be integrated into the buildingwithout

decreasing the perorance o the building

enveope and the partition was o the building

or externa oisture, re and acoustics, and

) be capabe o drawing air through trickle

ventilatorsor permanent openingsro the

roo or adjacent spaces. The permanent

openingsto the surrounding spaces and

trickle ventilatorsto the outsidesha have

an equivalent aerodynamic areagreater

than the equivalent aerodynamic areao

the passive stack ventilator. This is to ensure

air can be drawn through the passive stack

ventilatoreectivey.

g) when extracting ro kitchens:

i) aintain the re separation o the re

separated shat with a pressure-oring

intuescent re coar around a

coapsibe duct, and

ii) have ducting, downstrea o the re

coar, ade o non-cobustibe ateria,and

iii) have connections that contain no ore

than two bends and do not have any duct

that is ore than 45 to the vertica, and

Figure 1: Fire Shunt System

Paragraph 1.3.7


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iv) have the branch connection to the

coon duct via a re shunt o 1800

in height (see Figure 1), and

v) have the re shunt and the stack ocated

in a re separatedshat.

h) when extracting ro bathroos, toiets and

aundries:

i) be instaed in a re separatedshat, and

ii) have the branch connection to the

common extract ductvia a re shunt o

900 in height (see Figure 1), and

iii) have connections that contain no ore

than two bends and do not have any duct

that is ore than 45 to the vertica, and

iv) be ducting ade o non-cobustibe

ateria, uness the common extract duct

is the ony duct in the re separated shat.

i) have ventiation ducts and stacks that are

insuated in any unheated areas with a

iniu thickness o 25 o a ateria

having a thera conductivity o no ess than

0.04W/2K, and

j) have a condensation trap tted to the part

o the duct above the roo eve.

1.3.8 The terina o a passive stack ventilator

sha:

a) have an equivalent aerodynamic areagreater

than the cross-sectiona area o the stack, and

b) extend above the roo to at east the ridge

height.

Trickle ventilators

1.3.9Trickle ventilatorsare devices that have an

opening to the outside. Trickle ventilatorssha:

a) have an opening o no ess than 2000 2equivalent aerodynamic area, and

b) be ocated to iniise draughts, and

c) be secured to keep pests and insects out, and

d) have acoustic attenuation, i required by

NZBC G6 Airborne and Ipact Sound, and

e) be controabe and cosabe in a conditioned

spaces, and

) be instaed in household units, providing

they do not contain echanica suppy

ventiation, and

g) have the su o the equivalent aerodynamic

areagreater than the su o the equivaent

area o the passive stack ventilator(s), i

instaed in a household unit, and

h) have the equivalent aerodynamic area, based

on the nuber o occupants, or the space

as given in Tabes 1 and 2, and

COMMENT:

To copy with b) the outet o the passive stack

ventilatorshoud be paced at the ridge o the roo to

reduce the adverse eects o wind gusts.

Table 2: Total required equivalent aerodynamic area per space (mm)

Paragraph 1.3.9

Number o occupants

Ventilator locations 1 2 3 4 5

High and ow eve 4000 8000 12,000 16,000 20,000

High eve ony 3000 6000 9000 12,000 15,000

Table 1 : Number o occupants

Paragraph 1.3.9

Household unit

accommodation unit type

Number o people

Studio 2

1 bedroo 2

2 bedroo 3

Greater than 2 bedroos Add 1 per bedroo


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1.5 Mechanical ventilation

1.5.1 mechanica ventiation systes ust

satisy the oowing conditions:

a) outdoor air supply sha be designed

and equipent instaed to copy with

NZS 4303, or AS 1668.2 (excuding Tabe A1

and Sections 3 and 7), and to provide outdoor

air to occupied spacesat the fow rates given

in NZS 4303 Tabe 2, and

b) air-handling systems sha be instaed

and aintained to the requireents o

AS/NZS 3666.1 and AS/NZS 3666.2, and

c) extract ventilation sha:

i) be constructed so that any products isted

in Cause G4.3.3 are reoved, coected

or diuted by ventiation rates and

ethods set out in AS 1668.2 Section 5

COMMENT:

Positive pressure aows good contro o intake air

itration, whereas under negative pressure, unitered

air ay be drawn through gaps and openings in building

elements.

COMMENT:

Negative pressure reduces the ikeihood o

containants being spread to other spaces.

ii) where provided to reove oisture

and other containants ro kitchens,

bathroos, toiet spaces and aundries

in household units, exhaust the air to the

outside at fow rates given in AS 1668.2,

Tabe B1, and

iii) where provided or extract ro kitchens,

bathroos, toiets and aundries in

buildingscontaining household units

or accoodation units, reer to

Paragraphs 1.5.2 and 1.5.3.

d) outdoor air intakes sha be ocated to avoid

containation ro any oca source in

accordance with AS 1668.2 Cause 4.3.1

and NZS 4303 Cause 5.5, ande) recirculated air systems sha copy with

AS 1668.2 Cause 4.5, and

) contaminated air discharge systems sha

discharge containated air in a way that

copies with AS 1668.2 Cause 5.10, and

g) fltration sha copy with AS 1668.2

Cause 4.4, and

h) commissioning sha copy with CIBSE

Code Series A.

COMMENT:

Coercia kitchen extract ventiation is incuded

in AS 1668.2 Section 5.

Extract ventilation rom buildings containing

household units and accommodation units

1.5.2 Extract ventiation ro kitchens ust:

a) aintain the re separation o the re

separated shat with a pressure-oring

intuescent re coar around a coapsibe

duct, and

b) have ducting, downstrea o the re coar,

ade o non-cobustibe ateria, and

c) have the branch connection to the common

extract ductocated in a re separated shat,

and

d) have the re shunt and common extract duct

ocated in a separated shat.

1.5.3 Extract ventiation ro bathroos, toiets

and aundries ust:

a) be instaed in a re separated shat, and

b) have the branch connection to the common

extract ductvia a re shunt o 900 in

height, and

c) be ducting ade o non-cobustibe

ateria, uness the common extract ductis

the ony duct in the re separated shat.

Car park ventilation1.5.4 mechanica ventiation o car parks sha

copy with the echanica ventiation part

o AS 1668.2 Section 7.

Positive and negative pressure

1.5.5Buildinginteriors ventiated by echanica

systes incorporating tration sha, except

where Paragraph 1.4.4 appies, be aintained

at a positive pressure.

1.5.6 Spaces in which echanica ventiation is

used to reove or coect containants sha be

aintained at negative pressure reative to

other spaces in the building.


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1

2.0 Ventilation o Spaces Containing

Gas-uel Appliances

2.1 Natural ventilation

2.1.1 Natura ventiation systes or appiancesburning gas ue designed to operate under

natural draughtconditions sha:

a) Suppy air under equa pressure conditions to

the burners and to the draught diverteri.e. in

the sae roo and as cose as possibe to

the appiance, and

b) For non room-sealed applianceshaving a

cobined gas input exceeding 1 kW or each

3 o the space in which they are instaed,

be provided with vents, in addition to the

ventiation required by Paragraphs 1.1 and

1.2. The vents sha be sized and ocated

according to Paragraphs 2.1.3 to 2.1.8.

2.1.2 Doestic gas cookers in non roo-seaed

spaces which are aso used or seeping, require

peranent venting to the outside. The size o the

vent sha be appropriate to the gas input to the

cooker and sha be subject to specic design.

2.1.3 Vent sizes

Two peranent vent openings, one high eve

and one ow eve, sha be provided, each with

a ree ventiation area per kW o gas input (o a

appiances in the space) o no ess than:

a) 1200 2 or spaces vented directy to the

outside, and

b) 2300 2 or spaces vented via adjacent

spaces.

2.1.4 The vent opening areas given in Paragraph

2.1.3 ay be haved or pant roos and boier

roos inrequenty occupied by peope.

2.1.5 Vent openings sha have vertica

diensions o no ess than 50 , and no

diension o ess than 6.0 in any

other direction.

2.1.6 low-eve vents sha have their ower

edge no ore than 100 above foor eve,

and upper-eve vents sha have their ower

edge no ess than 75 above the top o the

draught diverter reie opening.

2.1.7 A ouvred door is aso an acceptabe

ethod o ventiation provided the botto o

the ree area extends to not ess than 100

above the foor, and the requisite high-eve ree

area is avaiabe ro the eve o 75 above

the draught diverterreie opening.

2.1.8 In pant roo or boier roo instaations,

ow- and high-eve vents ay be cobined into

a singe opening, provided it reaches ro foor

to ceiing and has a tota ree area equivaent to

that required or the two separate vents.

2.2 Mechanical ventilation

2.2.1 When echanica ventiation is used, the

syste sha have either:

a) mechanica suppy with echanicaextraction, or

b) mechanica suppy with natura exhaust.

2.2.2 A echanica ventiation syste sha:

a) For each kW o gas consuption (o a

appiances in the pant roo) provide outdoor

airat the rate o:

i) 3.6 3/h or orced or induced draught

appliances, and

ii) 7.2 3/h or appiances with atmospheric

burners, and

b) Reove exhaust air ro the roo either:

i) echanicay at one third the inet rate, or

ii) naturay via high-eve openings having a

ree ventiation area o no ess than 600

2 per kW o tota gas consuption or

a appiances in the roo.

2.3 Flue construction

2.3.1 A fuesyste sha have:

a) The cross-sectiona area o a natural draught

fuesyste externa to the appiances, no

ess than the cross-sectiona area o the

appiance outet, or

b) The fuedesigned to copy with NZS 5261

Appendix F, and

c) I a draught diverteris not tted:


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i) fueproducts discharged to the

atosphere ony at the fueterina,

uness the discharge at other ocations can

be achieved without hazard to persons,

property or appiance operation, and

ii) a ethod o autoaticay shutting down

the ain burners o orced or induced

draught appliances, shoud the nora

ree discharge o the fuebe interrupted.

2.3.2 Draught diverters

Draught diverterinstaations sha discharge

the tota fueproducts incuding excess air

and draught diverterdiution air, at the fue

terina without spiage ro the skirt o the

draught diverter.

2.4 Flue locations on dwellings

2.4.1 The ocation o a fueterina on a

dweing sha have:

a) Outets ro natural draught fuesor

chimneys, positioned reative to surrounding

construction to avoid wind causing down

draughts in the fue,

b) Fluepipes which extend through the roo,

terinated no coser than:

i) 500 to the nearest part o any roo,

ii) 2.0 to the roo eve o a fat roo

intended or persona or pubic use, and

iii) 500 above any parapet, and

c) Flueswhich terinate on the wa o a

buildingocated cear o inets or outside air

in accordance with the iniu cearances

specied in NZS 5261 Figure 2.

3.0 Another Solution or Gas-uel

Appliances

3.0.1 NZS 5261 Part 2 Appendices A to H, J

and l is an Acceptabe Soution, but ay

exceed the perorance criteria o NZBC G4.


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21

Appendix 1 Typica apartent

ayouts and ventiation options

Table 3: Ventilation options Layout 1

Figure 2

Room Natural ventilation

(Paragraph)

Mechanical

ventilation

(Paragraph)

Combined ventilation (Paragraph)

Bedroo 1.3.5 1.5

living 1.3.4 1.5 1.4.2 (10 ax dist) or 1.4.3 (6 ax dist)

Kitchen 1.3.2 1.5 1.4.2 (10 ax dist) or 1.4.3 (6 ax dist)

Bathroo 1.3.3 1.5 1.4.2 (10 ax dist) or 1.4.3 (6 ax dist)

Figure 2: Layout 1

Tabe 3

External

wall

Opening

windows

or trickle

ventilators

in outside

wallInternal

wall

metre max applies to Paragraphs 1..2,

1.., and 1...

10 metre max applies to Paragraphs 1..,

1.. and 1..2.

m max or Paragraph 1..


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Figure 3


(Paragraph)

Mechanical

ventilation(Paragraph)


Bedroos 1.3.5 1.5




Figure 3: Layout 2

Tabe 4

External

wall

Opening

windows

or trickle

ventilators

in outside

wall

Internal

walls


10 m max or Paragraph 1..




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2


Figure 4


(Paragraph)

Mechanical

ventilation

(Paragraph)


Bedroos 1.3.5 1.5




Figure 4: Layout 3

Tabe 5

External

wall

Internal

walls

10 m max or Paragraph 1..2




Opening

windows

or trickle

ventilators

in outside

wall


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1 N o v e m b e r 2 0 0 8 2


25/26


V E N T I L A T I O NIn de x G 4/V M1 & AS 1

2

Index G4/Vm1 & AS1A reerences to Verication methods and Acceptabe Soutions are preceded by VM or AS

respectivey.

Air-handling systems ............................................................AS1 1.5.1 b)

Air purity .......................................................................................VM1 2.0

Car park ventilation ...................................................................AS1 1.5.4

Combined natural ventilation and

mechanical ventilation.................................................................AS1 1.4

Contaminated air discharge systems ..................................AS1 1.5.1 )

Gas-uel appliances ......................................................................AS1 2.0

another soution .........................................................................AS1 3.0

draught diverters .................................................................... AS1 2.3.2

fue construction ........................................................................AS1 2.3

fue ocation on dweings ..........................................................AS1 2.4

echanica ventiation ................................................................AS1 2.2

natura ventiation .......................................................................AS1 2.1

Extract ventilation .................................................................AS1 1.5.1 c)

Mechanical ventilation..........................................................AS1 1.5, 2.2

Natural ventilation ...................................................AS1 1.1, 1.2, 1.3, 2.1

Natural ventilation o household units

and accommodation units with one

external wall..................................................................................AS1 1.3

Outdoor air supply.............................................................AS1 1.5.1 a) d)

Passive stack ventilators ..........................................................AS1 1.3.7

Positive and negative pressure................................................AS1 1.5.5

Recirculated air systems.......................................................AS1 1.5.1 e)

Trickle ventilators ......................................................................AS1 1.3.9

Ventilation rate ............................................................................VM1 1.0


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