G4/AS1: Ventilation

G4 VENTILATION ACCEPTABLE SOLUTION G4/AS1 General Part 1. General 1.1 Introduction 1.1.1 Scope of this document 1.1.1.1 This acceptable solution can be used for the ventilation of buildings. 1.1.2 Items outside the scope of this document 1.1.2.1 There are no specific items outside the scope of this document. 1.1.3 Compliance pathway 1.1.3.1 This acceptable solution is one option that provides a means of establishing compliance with the functional requirements and performance criteria in Building Code clause G4 Ventilation. It can be used to demonstrate compliance with performance clauses: a) G4.3.1 for the ventilation of buildings with outdoor air to maintain air purity; and b) G4.3.2 for the construction and maintenance of mechanical air-handling systems to prevent growth of harmful bacteria, pathogens, and allergens; and c) G4.3.3 for the collection and removal of the following products from spaces where they are generated: i) cooking fumes and odours, or ii) moisture from laundering, utensil washing, bathing, and showering, or iii) odours from sanitary and waste storage spaces, or iv) gaseous by-products and excessive moisture from commercial or industrial processes, or v) poisonous fumes and gases, or vi) flammable fumes and gases, or vii) airborne particles, or viii) bacteria, viruses or other pathogens, or ix) products of combustion; and d) G4.3.4 for the disposal of contaminated air; and e) G4.3.5 for the ventilation of spaces with fixed combustion appliances. 1.1.3.2 If this acceptable solution cannot be followed in full, use an alternative means to demonstrate compliance. 1.2 Using this acceptable solution 1.2.1 Determining the classified use 1.2.1.1 Classified uses for buildings are described in clause A1 of the Building Code. Where a specific classified use is mentioned within a subheading and/or within the text of a paragraph, this requirement applies only to the specified classified use(s) and does not apply to other classified uses. 1.2.2 Building Product Specifications 1.2.2.1 This acceptable solution refers to the Building Product Specifications for building product standards and specifications in relation to their manufacture, fabrication, testing, quality control, physical properties, performance, installation, and/or maintenance. 1.2.2.2 The Building Product Specifications cannot be used in isolation to demonstrate compliance with any requirement of the Building Code. To comply with G4/AS1, building products MINISTRY OF BUSINESS, INNOVATION AND EMPLOYMENT 28 JULY 2025 Page 6