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Status of Compliance Documents

Compliance Documents are prepared by the Department of Building and Housing in accordance with section 22 of the Building Act 2004. A Compliance Document is for use in establishing compliance with the New Zealand Building Code.

A person who complies with a Compliance Document will be treated as having complied with the provisions of the Building Code to which the Compliance Document relates. However, a Compliance Document is only one method of complying with the Building Code. There may be alternative ways to comply.

Users should make themselves familiar with the preface to the New Zealand Building Code Handbook, which describes the status of Compliance Documents and explains alternative methods of achieving compliance.

Defined words (italicised in the text) and classified uses are explained in Clauses A1 and A2 of the Building Code and in the Definitions at the start of this Compliance Document.

G4: Document History
	Date	Alterations
First published	July 1992
Amendment 1	September 1993	p. 3, 1.1.2
Reprinted incorporating Amendment 1	July 1994
Second edition	28 February 1998	Document revised – second edition issued
Amendment 1	23 June 2007	p. 2, Document History, Status p.5, Contents p.7, References p.9, Definitions pp. 13–16 G4/AS1
Third edition	1 November 2008	Document revised – third edition issued
Note: Page numbers relate to the document at the time of Amendment and may not match page numbers in current document.

Document Status

The most recent version of this document, as detailed in the Document History, is approved by the Chief Executive of the Department of Building and Housing. It is effective from 1 November 2008 and supersedes all previous versions of this document.

People using this Compliance Document should check for amendments on a regular basis. The Department of Building and Housing may amend any part of any Compliance Document at any time. Up-to-date versions of Compliance Documents are available from www.dbh.govt.nz

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New Zealand Building Code Clause G4 Ventilation

This Clause is extracted from the New Zealand Building Code contained in the First Schedule of the Building Regulations 1992 and amended by the Building Amendment Regulations 1997.

FIRST SCHEDULE—continued

Clause G4–VENTILATION

Provisions

OBJECTIVE
G4.1 The objective of this provision is to safeguard people from illness or loss of amenity due to lack of fresh air.

FUNCTIONAL REQUIREMENT
G4.2 Spaces within buildings shall be provided with adequate ventilation consistent with their maximum occupancy and their intended use.

PERFORMANCE
G4.3.1 Spaces within buildings shall have means of ventilation with outdoor air that will provide an adequate number of air changes to maintain air purity.

G4.3.2 Mechanical air-handling systems shall be constructed and maintained in a manner that prevents harmful bacteria, pathogens and allergens from multiplying within them.

G4.3.3 Buildings shall have a means of collecting or otherwise removing the following products from the spaces in which they are generated:

(a) Cooking fumes and odours,

(b) Moisture from laundering, utensil washing, bathing and showering,

(c) Odours from sanitary and waste storage spaces,

(d) Gaseous by-products and excessive moisture from commercial or industrial processes,

(e) Poisonous fumes and gases,

(f) Flammable fumes and gases,

(g) Airborne particles,

(h) Bacteria, viruses or other pathogens, or

(i) Products of combustion.

Limits on application

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FIRST SCHEDULE—continued

Provisions	Limits on application
G4.3.4 Contaminated air shall be disposed of in a way which avoids creating a nuisance or hazard to people and other property.
G4.3.5 The quantities of air supplied for ventilation shall meet the additional demands of any fixed combustion appliances.

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	Page
References	7
Definitions	9
Verification 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 Natural ventilation – General	13
1.3 Natural ventilation of both household units and accommodation units with one external wall	13
1.4 Combined natural ventilation and mechanical ventilation	17
1.5 Mechanical ventilation	18
2.0 Ventilation of Spaces Containing Gas-fuel Appliances	19
2.1 Natural ventilation	19
2.2 Mechanical ventilation	19
2.3 Flue construction	19
2.4 Flue locations on dwellings	20
3.0 Another Solution for Gas-fuel Appliances	20
Appendix 1 Typical apartment layouts and ventilation options	21
Index	25

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Status of Compliance Documents

Document Status

New Zealand Building Code Clause G4 Ventilation

FIRST SCHEDULE—continued

Clause G4–VENTILATION

FIRST SCHEDULE—continued

Contents

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