Acceptable Solutions and Verification Methods For New Zealand Building Code Clause G4 Ventilation

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.

G4 Ventilation Acceptable Solution G4/VM1 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 rate and air purity. The fifth edition has been published in standalone format with improved clarity, a consistent structure, and updated terminology.

AS/NZS 5601.1:2013 and the Workplace Exposure Standards are updated to the latest versions, including consequential changes to G4/AS1 paragraphs 2.4.1(c) and 3.0.1.

Cited content in this document can be found on the Building CodeHub website.

All of the Acceptable Solutions and Verification Methods relating to G4 are contained in one document.

• G4/VM1 Provides calculations for ventilation rates and air purity.
• G4/AS1 gives design solutions for different occupancies and combinations of natural and mechanical ventilation. It includes kitchens, bathrooms, toilets, and laundries, both with and without an external wall. It provides one means of complying for the ventilation of spaces containing gas-fuel appliances.

G4 Ventilation – G4/VM1, G4/AS1. Third edition, Amendment 2. Effective from 10 October 2011 until 14 August 2014.