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AS 1668.2-2012

[Pending Revision]

The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings

Included in Ductwork and air handling systems set
AS 1668.2 2012 sets out requirements for mechanical air-handling systems that ventilate buildings and car parks, and for ventilation based on the need to control odours, particulates and specific gases. Also known as AS 1668 part 2.
Published: 20/11/2012
Pages: 113
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.2.1 General
1.2.2 Mechanical ventilation systems selection
1.3 Normative references
1.4 Definitions
1.5 Combination ventilation systems
1.6 Residual ventilation
1.7 System operation
2 Mechanical ventilation—supply systems
2.1 Scope of section
2.2 Notation
2.2.1 Symbols
2.2.2 Occupancy
2.3 Outdoor air intakes
2.3.1 Location
2.3.2 Passage of air
2.4 Tundishes and floor wastes
2.5 Filtration
2.6 Prohibition of recycle air
2.7 Outdoor air mixing and distribution
2.8 Outdoor airflow rates
2.8.1 General
2.8.2 Minimum required outdoor airflow rate
2.8.3 Minimum required effective outdoor airflow rate
2.8.4 Minimum effective outdoor air Based on area of the enclosure Based on the number of occupants in the enclosure
2.8.5 Calculation of effective outdoor airflow rate General Air-handling system serving a single enclosure or providing 100% outside air Air-handling system supplying air to multiple enclosures For an air-handling system that includes factors that might modify the quantity of effective outdoor air
2.8.6 Variable air volume systems
2.8.7 Make-up air requirement
2.9 Outdoor airflow adjustment
2.9.1 Systems serving enclosures in which the temperature may exceed 27°C under normal operation
2.9.2 Systems serving enclosures with transient or variable occupancy
2.9.3 Demand control ventilation (DCV)
3 Mechanical ventilation—exhaust systems
3.1 Scope of section
3.2 Exhaust ventilation
3.2.1 General
3.2.2 Exhaust locations
3.2.3 Enclosures served by both supply and general exhaust systems
3.3 Local exhaust
3.3.1 Types of effluent requiring local exhaust
3.3.2 Effluent removal General requirements Type A effluent removal Type B effluent removal Grease vapour
3.4 Kitchen exhaust hoods
3.4.1 General
3.4.2 Hood and cooking process types General Hood type nomenclature Cooking process type nomenclature
3.4.3 Hoods serving non-grease-producing equipment
3.4.4 Specific cooking devices
3.4.5 Proprietary exhaust allowance
3.4.6 Charcoal and solid fuel appliances
3.5 Kitchen exhaust hood airflow—prescriptive procedure
3.6 Ventilated ceilings and proprietary kitchen exhaust equipment (hood types 5 and 7)
3.7 Air from enclosures having exhaust air requirements
3.7.1 General requirements
3.7.2 Air pressures
3.8 Replenishment of exhaust air
3.8.1 Source
3.8.2 Amount
3.8.3 Make-up air for kitchen exhaust hoods
3.8.4 Pressure drop
3.8.5 Electrical interlocking of exhaust and supply air
3.9 Combination of exhaust systems
3.10 Air discharges
3.10.1 General
3.10.2 Discharges not deemed objectionable
3.10.3 Discharges deemed objectionable
3.10.4 Non-required discharges
4 Ventilation of enclosures used by vehicles with combustion engines
4.1 Scope of section
4.2 Application of section
4.2.1 General application
4.2.2 Other occupancies
4.3 Notation
4.3.1 Symbols
4.3.2 Number of car spaces
4.4 Car parks
4.4.1 General
4.4.2 Ventilation distribution
4.4.3 Simple procedure for small car parks
4.4.4 Detailed procedure Contaminant generation rate Airflow rate
4.5 Enclosures other than car parks
4.5.1 Enclosed driveways associated with buildings
4.5.2 Loading docks
4.5.3 Automotive service and repair shops General Direct ducting from tailpipes Direct ducting—Simple procedure Direct ducting—Detailed procedure Dynamometer engine testing
4.5.4 Vehicular lifts and shafts Exhaust ventilation of vehicular lift cars Exhaust ventilation of vehicular lift shafts
4.5.5 Areas used by special purpose vehicles
4.6 Queuing areas
4.6.1 General
4.6.2 Queuing length
4.6.3 Airflow rate and distribution of air
4.7 Air pressure
4.8 Make-up of exhaust air
4.9 Exhaust air discharge
4.10 Combination systems
4.11 Ventilation control
4.11.1 General
4.11.2 System operation
4.11.3 Small car parks
4.11.4 Make-up air
4.12 Monitoring of atmospheric contaminants
4.12.1 General
4.12.2 System requirements
4.12.3 Operation and accuracy of CO monitors
4.12.4 Analysis of CO response time of monitoring systems
4.12.5 Sampling points Location and number Enclosure area
4.12.6 Marking, commissioning, reliability and records
5 Mechanical ventilation of enclosures used for particular health care functions
5.1 Scope of section
5.2 Application of section
5.3 Operating rooms
5.3.1 General
5.3.2 Air change rate
5.3.3 Recirculation
5.3.4 Outdoor air rate
5.3.5 Supply air filtration
5.3.6 Recycle and exhaust grille location
5.3.7 Room air pressure
5.4 Sterile store and set-up rooms
5.4.1 General
5.4.2 Outdoor air rate
5.4.3 Recirculation
5.4.4 Room air pressure
5.5 Infectious isolation rooms
5.5.1 General
5.5.2 Recirculation
5.5.3 Outdoor air rate
5.5.4 Exhaust air rate
5.5.5 Room air pressure
5.6 Protective isolation rooms
5.6.1 General
5.6.2 Supply air rate
5.6.3 Recirculation
5.6.4 Outdoor air rate
5.6.5 Room air pressure
5.7 Post anaesthetic care unit (PACU) (Recovery Stage 1)
5.7.1 General
5.7.2 Recirculation
5.7.3 Exhaust air rate
5.8 Autopsy rooms
5.8.1 General
5.8.2 Recirculation
5.8.3 Exhaust air rate
5.8.4 Exhaust location
5.8.5 Room air pressure
5.9 Dirty utility rooms
5.9.1 General
5.9.2 Recirculation
5.9.3 Exhaust air rate
5.9.4 Room air pressure
Appendix A
Appendix B
B1 Application
B2 General exhaust for enclosures
Appendix C
Appendix D
D1 General
D2 Notation
D3 Minimum introduced outdoor airflow rate
D4 Residual effective outdoor airflow
D4.1 General
D4.2 Effective outdoor airflow from recycle air
D4.3 Effective outdoor airflow from transfer air
D4.4 Effective outdoor airflow from local air cleaning
D4.5 Effective outdoor airflow from supply air cleaning
D4.6 Effective outdoor airflow from central air cleaning
D5 Efficiencies of air-cleaning units
D5.1 General
D5.2 Test methods for odours
D5.3 Test methods for particulate contaminants
D6 Calculation procedure
D7 Example (Central air cleaning—Particulate filtration only)
D8 Example (Central air cleaning—Particulate filtration and odour treatment)
Appendix E
E1 Scope
E2 Application
E3 Hood construction
E3.1 General
E3.2 Manufacture
E3.3 Openings
E3.4 Internal surface
E3.4.1 Sloping
E3.4.2 Profile
E3.4.3 Hood gutters
E3.4.4 Distance from grease gutter to perimeter of appliance
E3.4.5 Internal light fittings
E4 Hood installation
E5 Kitchen exhaust hoods incorporating grease-removal filters
E6 Kitchen exhaust hoods incorporating grease-removal devices
E7 Distance from grease-removal device to heat source
E7.1 General
E7.2 Text deleted
E8 Kitchen exhaust hood airflow—calculations—examples
E8.1 General
E8.2 Low sidewall hoods (hood Type 1) calculation example
E8.3 Corner-mounted hoods (hood Type 2) calculation example
E8.4 Sidewall hoods (hood Type 3) calculation example
E8.5 Island hoods (hood Type 4) calculation example
E9 Hood type nomenclature
Appendix F
F1 Scope
F2 Design objectives
F3 Proposal submission and approval
F4 Air contaminants
F5 Control of contaminants
F5.1 Type 1 contaminants
F5.2 Type 2 contaminants
F6 Evaluation of air quality
F6.1 General
F6.2 Type 1 contaminants
F6.3 Type 2 contaminants
F6.3.1 General
F6.3.2 Form 1 evaluation
F6.3.3 Form 2 evaluation
F6.3.3.1 General
F6.3.3.2 Principles
F6.4 Variation of test approach
F7 Evaluation of devices and systems
F8 Monitoring
Appendix G
G1 Lag time
G2 Lead time
Appendix H
H1 General car park
H2 Exposure standards
H3 Short-term exposures
Appendix I
Appendix J
J1 Fleet average co emission rates on cold engine start
J2 Average car speed in car park
J3 Ambient co concentration
J4 Parking times
J5 Co Criteria
J6 Formulae
J7 Derivation of formulae
J8 Basis of Table 4.1
J9 Basis of area minimum
J10 Basis for staff exposure factor (Table 4.3)
Appendix K
K1 Car parks with pay booths
K2 Car parks without pay booths
Appendix L
L1 Exit lanes
L2 Entry lanes
L3 Diesel vehicles
Appendix M
M1 Marking
M2 Commissioning
M3 Reliability
M4 Records
Appendix N
N1 Performance application
N2 Mechanical ventilation
N3 Mixed ventilation
N4 Other arrangements
N5 Basis for exposure limits
Appendix O
Amendment control sheet
AS 1668.2—2012
Amendment No. 1 (2013)
Amendment No. 2 (2016)
Revised text
Cited references in this standard
[Available Superseded]
The use of ventilation and airconditioning in buildings, Part 1: Fire and smoke control in multi-compartment buildings
[Available Superseded]
Refrigerating systems, Part 2: Safety requirements for fixed applications
Pre-engineered fire protection systems for cooking equipment
High efficiency particulate air (HEPA) filters — Classification, construction and performance
Guide to the installation, maintenance, testing and replacement of secondary batteries in buildings, Part 2: Sealed cells
Content history
[Available Superseded]
DR AS 1668.2
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