AS 1668.2:2024 The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings
Standards Australia
This Standard was prepared by Standards Australia Committee ME-062, Ventilation and Airconditioning, to supersede AS 1668.2:2012, The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings.
The objective of this document is to provide users with requirements for mechanical ventilation of buildings. It includes minimum design parameters for determining ventilation rates for general application in buildings.
This document has been prepared for reference in the National Construction Code (NCC).
This edition of the document has been revised and updated to improve users’ ability to conform to the technical requirements and reflect contemporary technologies and practices. The main technical changes in this edition are:
(a) Non-quantified performance requirements and terms have been replaced by quantified prescriptive requirements.
(b) Calculation of minimum outdoor airflow rates have been presented in simple and detailed formats, the concept of borrowed ventilation air has been introduced for some spaces and residential exhaust ventilation requirements have been aligned with provisions for condensation management introduced by the NCC since the last revision of this document.
(c) Contaminant generation rates for vehicles have been updated to reflect the more widespread use of emission control catalysts, engine technology advances, engine management systems and low-emission fuels in the contemporary Australian vehicle fleet, all leading to reduced required ventilation rates for carparks.
(d) Sections on kitchen exhaust and health care ventilation have been generally updated and expanded to align with contemporary practice and technology, including a new compliance pathway for treated kitchen exhaust discharge.
The commentary in this document has been expanded to improve user understanding of the requirements.
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.
First published as AS 1668.2-1976. Previous edition 2012. Sixth edition 2024.Contents:
Section 1: Scope And General
Section 2: Mechanical Ventilation — Supply Systems
Section 3: Mechanical Ventilation — Exhaust Systems
Section 4: Ventilation Of Enclosures Used By Vehicles With Combustion Engines
Section 5: Mechanical Ventilation Of Enclosures Used For Particular Health Care Functions
Appendix A: (Normative) Minimum Effective Outdoor Airflow Requirements Based On Occupancy
Appendix B: (Normative) Minimum Mechanical Exhaust Air Requirements Based On Use Of Enclosure
Appendix C: (Informative) Outdoor Air Contaminant Levels
Appendix D: (Normative) Principles Of Ventilation Airflow Analysis
Appendix E: (Normative) Kitchen Exhaust Hoods
Appendix F: (Informative) Performance-Oriented Approaches To Mechanical Ventilation System Design (Including System Component Selection)
Appendix G: (Informative) Rationale For Lag Or Lead Time For Transient Occupancy
Appendix H: (Informative) Commentary On Carbon Monoxide Exposure In Occupational Environments
Appendix I: (Informative) Examples Of Layouts Of Car Park Ventilation
Appendix J: (Informative) Basis Of Airflow Rates Formulae For Car Parks
Appendix K: (Informative) Basis For Length Of Vehicle Queue In Car Parks
Appendix L: (Informative) Derivation Of Airflow Rates For Queuing Areas In Car Parks
Appendix M: (Informative) Automatic Monitoring Systems For Car Parks — Marking, Commissioning, Reliability And Records
Appendix N: (Informative) Performance Application To Car Park Ventilation
Appendix O: (Informative) Local Exhaust Ventilation References
Ventilation and Airconditioning.
ME-062
Air Conditioning&Mechanical Contractors Association; Australasian Fire and Emergency Service Authorities Council; Australian Building Codes Board; Australian Industry Group; Australian Institute of Refrigeration Air Conditioning and Heating; Chartered Institution of Building Services Engineers; Construction Information Systems Limited (NATSPEC); Consumer Electronics Suppliers Association; Engineers Australia; Facility Management Association of Australia; Fan Manufacturers Association of Australia and New Zealand; Fire Protection Association Australia; Property Council of Australia.
