• AS 1668.2-1991

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    The use of mechanical ventilation and air-conditioning in buildings - Mechanical ventilation for acceptable indoor-air quality

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  06-25-2021

    Language(s):  English

    Published date:  01-01-1991

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 1668.2-1991 THE USE OF MECHANICAL VENTILATION AND AIR-CONDITIONING IN BUILDINGS - MECHANICAL VENTILATION .....
    4 - PREFACE
    5 - CONTENTS
    7 - SECTION 1 SCOPE AND GENERAL
    7 - 1.1 SCOPE
    7 - 1.2 APPLICATION
    7 - 1.2.1 Mechanical systems
    7 - 1.2.2 Natural systems of carparks
    7 - 1.3 REFERENCED DOCUMENTS
    9 - 1.4 DEFINITIONS
    9 - 1.4.1 Airflow rate (herein referred to as ‘flow rate’)
    9 - 1.4.2 Air-handling plant
    9 - 1.4.3 Air-handling system
    9 - 1.4.4 Air lock
    9 - 1.4.5 Air outlet
    9 - 1.4.6 Approved and approval
    9 - 1.4.7 Duct
    9 - 1.4.8 Enclosure
    9 - 1.4.9 Exhaust air
    9 - 1.4.10 Exhaust-air intake
    9 - 1.4.11 Exhaust outlet
    9 - 1.4.12 Exposure standard (ES)
    9 - 1.4.13 General exhaust ventilation
    9 - 1.4.14 Grease filter
    9 - 1.4.15 Hood
    9 - 1.4.16 Incinerette
    9 - 1.4.17 Indoor air
    9 - 1.4.18 Infiltration air
    9 - 1.4.19 Leakage air
    9 - 1.4.20 Local exhaust
    10 - 1.4.21 Make-up air
    10 - 1.4.22 May
    10 - 1.4.23 Objectional effluents
    10 - 1.4.24 Occupied zone
    10 - 1.4.25 Outdoor air
    10 - 1.4.26 Outdoor air intake
    10 - 1.4.27 Plant room
    10 - 1.4.28 Plenum
    10 - 1.4.29 Privacy lock
    10 - 1.4.30 Recycle air
    10 - 1.4.31 Regulatory Authority
    10 - 1.4.32 Relief air
    10 - 1.4.33 Required
    10 - 1.4.34 Return air
    10 - 1.4.35 Shall
    10 - 1.4.36 Should
    10 - 1.4.37 Spill air
    10 - 1.4.38 Supply air
    12 - SECTION 2 SUPPLY AIR DILUTION PROCEDURE
    12 - 2.1 SCOPE OF SECTION
    12 - 2.2 OUTDOOR-AIR INTAKES
    12 - 2.2.1 Location
    12 - 2.2.2 Passage of air
    12 - 2.3 OUTDOOR AIRFLOW RATES
    12 - 2.3.1 General
    12 - 2.3.2 Occupancy
    12 - 2.3.3 Minimum outdoor airflow rates, (qf ), to be supplied to an enclosure, based on area of the enclosure
    14 - 2.3.4 Minimum outdoor airflow rates, (qf ), to be supplied to an enclosure, based on number of occupants in the enclosure
    14 - 2.3.5 Minimum flow rate of outdoor air into a single-enclosure system (qF )
    14 - 2.3.6 Minimum flow rate of outdoor air into a system serving a group of enclosures (QF )
    15 - 2.3.7 Variable air volume systems
    15 - 2.3.8 Make-up air requirement
    15 - 2.4 PROHIBITION OF RECYCLE AIR
    16 - 2.5 OUTDOOR AIR MIXING AND DISTRIBUTION
    16 - 2.6 OUTDOOR AIR FLOW
    16 - 2.6.1 Systems serving enclosures in which the temperature may exceed 27°C under normal operation
    16 - 2.6.2 Systems serving enclosures with transient or variable occupancy
    19 - SECTION 3 EXHAUST AIR DILUTION PROCEDURE
    19 - 3.1 SCOPE OF SECTION
    19 - 3.2 GENERAL EXHAUST VENTILATION
    19 - 3.2.1 General
    19 - 3.2.2 Exhaust locations
    19 - 3.2.3 Enclosures served by both supply and general exhaust systems
    19 - 3.3 LOCAL EXHAUST
    19 - 3.3.1 Types of effluents requiring local exhaust
    19 - 3.3.2 Effluent removal
    19 - 3.3.2.1 General requirements
    19 - 3.3.2.2 Type A effluents removal
    19 - 3.3.2.3 Type B effluents removal
    20 - 3.4 AIR FROM ENCLOSURES HAVING EXHAUST-AIR REQUIREMENTS
    20 - 3.4.1 General requirements
    20 - 3.4.2 Return-air intake location
    20 - 3.4.3 Air pressures
    20 - 3.5 REPLENISHMENT OF EXHAUST AIR
    20 - 3.5.1 Source
    20 - 3.5.2 Amount
    20 - 3.5.3 Pressure drop
    20 - 3.5.4 Electrical interlocking of exhaust and make-up
    20 - 3.6 COMBINATION OF EXHAUST SYSTEMS
    20 - 3.7 AIR DISCHARGES
    20 - 3.7.1 General
    21 - 3.7.2 Discharges not deemed objectionable
    21 - 3.7.3 Obnoxious discharges
    21 - 3.7.4 Disposal of rainwater and condensate
    22 - SECTION 4 VENTILATION OF ENCLOSURES USED BY VEHICLES WITH INTERNAL COMBUSTION ENGINES
    22 - 4.1 SCOPE OF SECTION
    22 - 4.2 APPLICATION OF SECTION
    22 - 4.3 GENERAL CASE
    22 - 4.4 CARPARKS
    22 - 4.4.1 General
    28 - 4.4.2 Airflow rates
    29 - 4.4.3 Air openings
    30 - 4.5 ENCLOSURES OTHER THAN CARPARKS
    30 - 4.5.1 Enclosed driveways associated with buildings
    30 - 4.5.2 Loading docks
    30 - 4.5.3 Automotive service and repair shops
    30 - 4.5.4 Vehicular lifts and shafts
    30 - 4.5.5 Areas used by special-purpose vehicles
    31 - 4.6 QUEUING AREAS
    31 - 4.6.1 General
    31 - 4.6.2 Queuing length
    31 - 4.6.3 Airflow rate and distribution of air
    32 - 4.7 AIR PRESSURE
    32 - 4.8 REPLENISHMENT OF EXHAUST AIR
    32 - 4.9 EXHAUST-AIR DISCHARGE
    32 - 4.10 STAFF-VENTILATION RATE
    32 - 4.11 LOCATION OF EXHAUSTS IN BELOWGROUND ENCLOSURES
    32 - 4.12 ENERGY SAVING
    32 - 4.13 MONITORING OF ATMOSPHERIC CONTAMINANTS
    32 - 4.13.1 General
    32 - 4.13.2 System requirements
    33 - 4.13.3 Operation and accuracy of AC monitors
    33 - 4.13.4 Analysis of AC and operation of mechanical ventilation
    34 - 4.13.5 Sampling points
    34 - 4.13.6 Monitor failure
    34 - 4.13.7 Marking, commissioning, reliability and records
    35 - APPENDIX A - MINIMUM OUTDOOR-AIR REQUIREMENTS BASED ON CLASS OF OCCUPANCY
    39 - APPENDIX B - MINIMUM EXHAUST AIR REQUIREMENTS BASED ON USE OF ENCLOSURE
    40 - APPENDIX C - OUTDOOR AIR CONTAMINANT LEVELS
    41 - APPENDIX D - DERIVATION OF THE MULTIPLE ENCLOSURE FACTOR AND EQUATIONS FOR FILTRATION EFFICIENCIES .....
    41 - D1 DERIVATION OF THE MULTIPLE ENCLOSURE FACTOR*
    44 - D2 REQUIREMENTS FOR AIR CLEANING EFFICIENCY WITH SOME AIR CLEANING ARRANGEMENTS
    44 - D2.1 Symbols
    44 - D2.2 Single Enclosure
    44 - D2.2.1 Air treatment for particulates
    45 - D2.2.2 Air treatment for particulates and odours
    45 - D2.3 Multiple enclosure systems
    45 - D2.3.1 Central air cleaning unit serving all enclosures
    46 - D2.3.2 Air cleaning units for each enclosure
    47 - D2.3.3 Air cleaners on the supply to each enclosure
    48 - D2.3.4 Air cleaners for the critical enclosure only
    50 - D2.3.5 Combination of a central air-cleaning unit and a recirculating air-cleaning unit for the critical enclosure
    64 - APPENDIX E - KITCHEN EXHAUST HOODS
    64 - E1 SCOPE
    64 - E2 APPLICATION
    64 - E3 HOOD DESIGN AND MANUFACTURE
    64 - E3.1 General
    64 - E3.2 Manufacture
    64 - E3.3 Openings
    64 - E3.4 Internal lights
    64 - E4 DISTANCE FROM GREASE ARRESTING DEVICE TO HEAT SOURCE
    64 - E4.1 General
    64 - E4.2 Reduction of distances
    65 - E5 DISTANCE TO FLOOR LEVEL
    65 - E6 OPERATION INDICATOR
    65 - E7 KITCHEN EXHAUST HOODS INCORPORATING GREASE FILTERS
    65 - E7.1 Grease filters
    65 - E7.2 Grease arresting filters
    65 - E7.3 Hood gutters
    65 - E7.4 INTERNAL SURFACE
    65 - E7.4.1 Sloping
    65 - E7.4.2 Profile
    65 - E7.5 Distance from grease gutter to perimeter of appliance
    65 - E8 KITCHEN EXHAUST HOODS INCORPORATING GREASE REMOVAL DEVICES
    66 - APPENDIX F - CAPTURE OF EMISSIONS BY KITCHEN EXHAUST HOODS
    66 - F1 GENERAL
    66 - F2 FACTORS INFLUENCING EXHAUST FLOW RATE
    66 - F3 CALCULATION OF EXHAUST AIRFLOW RATE
    69 - F4 CAPTURE VELOCITY
    70 - APPENDIX G - A PERFORMANCE APPROACH TO ACCEPTABLE INDOOR AIR QUALITY
    70 - G1 SCOPE
    70 - G2 PROPOSAL SUBMISSION
    70 - G3 DESIGN OBJECTIVES
    70 - G4 INDOOR AIR QUALITY PROCEDURE
    70 - G4.1 General
    70 - G4.2 Quantitative evaluation
    71 - G4.3 Subjective evaluation
    71 - G4.4 Monitoring
    71 - G4.5 Information to be provided
    72 - APPENDIX H - VENTILATION REQUIREMENTS FOR INCINERETTES
    73 - APPENDIX J - RATIONALE FOR LAG OR LEAD TIME FOR TRANSIENT OCCUPANCY
    74 - APPENDIX K - BASIS FOR LENGTH OF VEHICLE QUEUE
    74 - K1 CARPARKS WITH PAY BOOTHS
    74 - K2 CARPARKS WITHOUT PAY BOOTHS
    75 - APPENDIX L - EXAMPLES OF LAYOUTS OF CARPARK VENTILATION
    80 - APPENDIX M - AUTOMATIC MONITORING SYSTEMS FOR CARPARKS MARKING, COMMISSIONING, RELIABILITY AND RECORDS
    80 - M1 MARKING
    80 - M2 COMMISSIONING
    80 - M3 RELIABILITY
    80 - M4 RECORDS

    Abstract - (Show below) - (Hide below)

    Sets out the requirements for air handling systems which ventilate enclosures by mechanical means. It sets minimum requirements for preventing an excess accumulation of airborne contaminants, or objectionable odours. It does not prescribe other requirements associated with comfort such as temperature, humidity, air movement or noise. The Standard also includes requirements for natural ventilation at carparks. Road tunnels are not addressed in this Standard.

    Scope - (Show below) - (Hide below)

    This Standard sets out requirements for air-handling systems which ventilate enclosures by mechanical means, where such systems are required by a Regulatory Authority. It sets minimum requirements for preventing an excess accumulation of airborne contaminants, or objectionable odours. These minima are based on needs for body odour control, food odour control, air contaminant control, or carbon dioxide concentrations or a combination of any or all of these factors, depending on the particular situation. It does not prescribe other requirements associated with comfort, such as temperature, humidity, air movement or noise. This Standard also includes requirements for natural ventilation of carparks. Road tunnels are outside the scope of this Standard.NOTES:1 Fire-safety aspects related to air-handling systems are covered in AS 1668.1.2 It is recommended that air-handling systems be designed, constructed and installed so that their use does not give rise to a nuisance arising from noise or vibration. For guidance on noise and vibration control see AS 1055 and AS 2107.

    General Product Information - (Show below) - (Hide below)

    Committee ME-062
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes

    History - (Show below) - (Hide below)

    Under Revision See DR 96425 First published as AS 1668.2-1976.Second edition 1980.Third edition 1991. First published as AS 1668.2-1976. Second edition 1980. Third edition 1991.

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 4429(INT)-1996 Methods of test and rating requirements for smoke-spill fans
    AS 4421-1996 Guards and patrols
    AS/NZS 2243.1:1997 Safety in laboratories - General
    AS 2834-1995 Computer accommodation
    AS/NZS 4114(INT):1993 Electrical equipment for explosive atmospheres - Spray painting booths - Design, construction, installation and maintenance
    AS 2021-2000 Acoustics - Aircraft noise intrusion - Building siting and construction
    AS/NZS 1677.2:1998 Refrigerating systems - Safety requirements for fixed applications
    AS 1894-1997 The storage and handling of non-flammable cryogenic and refrigerated liquids (Reconfirmed 2021)
    AS 4187-1994 Code of practice for cleaning, disinfecting and sterilizing reusable medical and surgical instruments and equipment, and maintenance of associated environments in health care facilities
    AS/NZS 1668.1:1998 The use of ventilation and airconditioning in buildings Fire and smoke control in multi-compartment buildings
    AS 2201.2-1992 Intruder alarm systems - Central stations
    AS 4326-1995 The storage and handling of oxidizing agents
    AS 2243.8-1992 Safety in laboratories - Fume cupboards
    AS/NZS 3666.1:2002 Air-handling and water systems of buildings - Microbial control - Design, installation and commissioning
    HB 37.4-1994 Handbook of Australian fire Standards Building materials, products and construction (Reconfirmed 2016)
    AS 4187-1998 Cleaning, disinfecting and sterilizing reusable medical and surgical instruments and equipment, and maintenance of associated environments in health care facilities
    AS 2201.2-2001 Intruder alarm systems - Monitoring centres
    AS 3533.1-1997 Amusement rides and devices - Design and construction
    AS 1668.1-1991 The use of mechanical ventilation and air-conditioning in buildings - Fire and smoke control
    AS/NZS 2982.1:1997 Laboratory design and construction - General requirements
    AS/NZS 4681:2000 The storage and handling of Class 9 (miscellaneous) dangerous goods and articles
    AS 2243.4(INT)-1994 Safety in laboratories Ionizing radiations
    AS/NZS 4114.1:1995 Spray painting booths - Design, construction and testing
    AS 2746-1999 Working areas for gas-fuelled vehicles
    AS 4429-1999 Methods of test and rating requirements for smoke-spill fans
    SAA/SNZ HB32:1995 Control of microbial growth in air-handling and water systems in buildings (Reconfirmed 2016)
    AS 2610.1-1993 Spa pools - Public spas
    AS 2243.4-1998 Safety in laboratories - Ionizing radiations
    AS 4508-1999 Thermal resistance of insulation for ductwork used in building airconditioning (Reconfirmed 2018)
    AS/NZS 2243.8:2001 Safety in laboratories - Fume cupboards
    AS/NZS 2927:2001 The storage and handling of liquefied chlorine gas
    AS/NZS 1269.4:1998 Occupational noise management - Auditory assessment
    AS/NZS 4452:1997 The storage and handling of toxic substances
    AS/NZS 3666.1:1995 Air-handling and water systems of buildings - Microbial control - Design, installation and commissioning
    AS 4332-1995 The storage and handling of gases in cylinders
    AS 4254-1995 Ductwork for air-handling systems in buildings
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