G4/AS1: Ventilation

G4 VENTILATION ACCEPTABLE SOLUTION G4/AS1 Main changes in this version Main changes in this version 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. This includes using a common structure for headings and text throughout the acceptable solution. • 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. Additional information on the document and its scope is provided in Part 1. General. • References have been revised to reflect the documents cited in this acceptable solution in Appendix A. • Definitions have been revised to reflect the terms used in this acceptable solution in Appendix B. • The acceptable solution now refers to the Building Product Specifications for air handling systems in Paragraph 2.3.1.1. As a consequence, reference AS/NZS 3666 has been removed from the acceptable solution. People using this document should check for amendments on a regular basis. The Ministry of Business, Innovation and Employment may amend any part of any acceptable solution or verification method at any time. Up-to-date versions of acceptable solutions or verification methods are available from www.building.govt.nz. MINISTRY OF BUSINESS, INNOVATION AND EMPLOYMENT 28 JULY 2025 Page 3