This Standard was prepared by the Standards Australia Committee ME-062, Ventilation and Airconditioning, to supersede AS 1668.4:2012 The use of ventilation and airconditioning in buildings, Part 4: Natural ventilation of buildings.

This document covers:

(a) natural ventilation of occupied enclosures; and
(b) natural ventilation within car parks and vehicle facilities.

In accordance with the philosophy of adopting a complementary approach to building regulations, this document provides a deemed to satisfy solution, for the natural ventilation of parts of buildings where nominated by the National Construction Code (NCC). The document also provides guidance that can assist with developing a performance solution for the design of natural ventilation systems for occupied enclosures and carparks, outside of the NCC deemed to satisfy requirements.

During the preparation of this document, consideration was given to many international and national Standards, design guides, technical papers, manuals and other publications.

This document is prescriptive, and calculations are presented as simple and detailed procedures.

The terms “normative” and “informative” are used in Standards to define the application of the appendices to which they apply. A “normative” appendix is an integral part of a Standard, whereas an “informative” appendix is only for information and guidance.