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Acceptable Solution G4/AS1: Ventilation of buildings and gas-fuel appliances

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Abbreviation
G4/AS1 (Fifth Edition)
Version
Fifth edition
Valid from
28/07/2025
Information provider
Ministry of Business, Innovation and Employment,
Information type
Acceptable Solution,
Format
PDF,
Cites
This resource cites 4 documents (show Citations)
Description

G4 Ventilation Acceptable Solution G4/AS1 Fifth Edition provides a compliance pathway for meeting the ventilation performance requirements of Clause G4 of the New Zealand Building Code, specifically for the ventilation of buildings and gas-fuel appliances.

The scope of the document includes natural, mechanical, and combined ventilation systems for spaces within buildings, as well as specific provisions for gas-fuel appliances and flue locations. It is suitable for a wide range of building types, including residential and commercial.

It references New Zealand and Australian standards and includes modifications to those standards.

The fifth edition has been published in standalone format with improved clarity, consistent structure, and updated terminology.

The acceptable solution references the Building Product Specifications for air handling systems. The fifth edition also includes minor amendments to correct formatting, grammar, and cross-references.

Scope

This acceptable solution can be used for the ventilation of buildings and gas fuel appliances.

Items outside the scope of this document

There are no specific items outside the scope of this document.

Previous versions:
G4/AS1 (Fourth Edition) (Fourth Edition (unamended))
G4/AS1 (Third Edition, Amendment 4)
G4/AS1 (Third Edition, Amendment 3)
G4/AS1 (Third Edition, Amendment 2)
G4/AS1 (Third Edition (unamended))
For assistance with locating previous versions, please contact the information provider.
Notes/comments

This acceptable solution is the fifth edition of G4/AS1. The main changes from the previous version are:

  • The document has been published in a standalone format and the layout has been revised to improve clarity
  • Portions of text have been re-written to enhance clarity in the document and provide consistent language with other acceptable solutions and verification methods.
  • A title of the document has been added to the document to reflect the scope of the acceptable solution.
  • References have been revised to reflect the documents cited in this acceptable solution. 
  • Definitions have been revised to reflect the terms used in this acceptable solution. 
  • The acceptable solution now refers to the Building Product Specifications for air handling systems. As a consequence, reference AS/NZS 3666 has been removed from the acceptable solution.
View on Information Provider website Download this resource (PDF, 663KB)
For assistance with locating previous versions, please contact the information provider.

This acceptable solution is the fifth edition of G4/AS1. The main changes from the previous version are:

  • The document has been published in a standalone format and the layout has been revised to improve clarity
  • Portions of text have been re-written to enhance clarity in the document and provide consistent language with other acceptable solutions and verification methods.
  • A title of the document has been added to the document to reflect the scope of the acceptable solution.
  • References have been revised to reflect the documents cited in this acceptable solution. 
  • Definitions have been revised to reflect the terms used in this acceptable solution. 
  • The acceptable solution now refers to the Building Product Specifications for air handling systems. As a consequence, reference AS/NZS 3666 has been removed from the acceptable solution.
This resource is not cited by any other resources.

Acceptable Solution G4/AS1: Ventilation of buildings and gas-fuel appliances

This document is not CITED BY any other resources:

Acceptable Solution G4/AS1: Ventilation of buildings and gas-fuel appliances

Description

G4 Ventilation Acceptable Solution G4/AS1 Fifth Edition provides a compliance pathway for meeting the ventilation performance requirements of Clause G4 of the New Zealand Building Code, specifically for the ventilation of buildings and gas-fuel appliances.

The scope of the document includes natural, mechanical, and combined ventilation systems for spaces within buildings, as well as specific provisions for gas-fuel appliances and flue locations. It is suitable for a wide range of building types, including residential and commercial.

It references New Zealand and Australian standards and includes modifications to those standards.

The fifth edition has been published in standalone format with improved clarity, consistent structure, and updated terminology.

The acceptable solution references the Building Product Specifications for air handling systems. The fifth edition also includes minor amendments to correct formatting, grammar, and cross-references.

View on Information Provider website Download this resource (PDF, 663KB)
Acceptable Solution G4/AS1: Ventilation of buildings and gas-fuel appliances
Description

G4 Ventilation Acceptable Solution G4/AS1 Fifth Edition provides a compliance pathway for meeting the ventilation performance requirements of Clause G4 of the New Zealand Building Code, specifically for the ventilation of buildings and gas-fuel appliances.

The scope of the document includes natural, mechanical, and combined ventilation systems for spaces within buildings, as well as specific provisions for gas-fuel appliances and flue locations. It is suitable for a wide range of building types, including residential and commercial.

It references New Zealand and Australian standards and includes modifications to those standards.

The fifth edition has been published in standalone format with improved clarity, consistent structure, and updated terminology.

The acceptable solution references the Building Product Specifications for air handling systems. The fifth edition also includes minor amendments to correct formatting, grammar, and cross-references.

View on Information Provider website Download this resource (PDF, 663KB)
This resource cites:

Acceptable Solution G4/AS1: Ventilation of buildings and gas-fuel appliances

This document CITES:
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