Standard
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AS 1668.2:2024
[Current]The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings
AS 1668.2:2024 provides users with minimum design parameters and guidelines for determining ventilation rates for general application in buildings
Published: 28/06/2024
Pages: 134
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Application – selection of mechanical ventilation
1.3 Normative references
1.4 Terms and definitions
1.5 Combination ventilation systems
1.6 Residual ventilation
1.7 System operation
2 Mechanical ventilation — supply systems
2.1 Scope
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
2.3.2.1 General
2.3.2.2 Warning label
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 Simple procedure
2.8.2.1 Single enclosure system
2.8.2.2 Multiple enclosure system
2.8.2.3 Outdoor air reductions
2.8.3 Detailed procedure
2.8.3.1 General
2.8.3.2 Minimum required introduced outdoor airflow rate
2.8.3.3 Minimum required effective outdoor airflow rate
2.8.3.4 Minimum effective outdoor air
2.8.3.4.1 Based on area of the enclosure
2.8.3.4.2 Based on the number of occupants in the enclosure
2.8.3.5 Calculation of effective outdoor airflow rate
2.8.3.5.1 General
2.8.3.5.2 Air-handling system serving a single enclosure or providing 100 % outdoor air
2.8.3.5.3 Air-handling system supplying air to multiple enclosures
2.8.3.5.4 Air-handling system that includes factors that might modify the quantity of effective outdoor air
2.8.4 Borrowed ventilation for secondary enclosures
2.8.5 Variable air volume systems
2.8.6 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
3 Mechanical ventilation — exhaust systems
3.1 Scope of section
3.2 General exhaust ventilation
3.2.1 General
3.2.2 Exhaust locations
3.2.3 Enclosures served by both supply and required general exhaust systems
3.3 Local exhaust ventilation
3.3.1 Types of effluent requiring local exhaust
3.3.2 Effluent management
3.3.2.1 General requirements
3.3.2.2 Type A effluent removal
3.3.2.3 Type B effluent removal
3.4 Kitchen exhaust hoods
3.4.1 General
3.4.2 Hood type and cooking process type
3.4.2.1 General
3.4.2.2 Hood type
3.4.2.3 Cooking process type
3.4.3 Hood overhangs
3.4.4 Hoods serving non-grease-producing equipment
3.4.5 Proprietary exhaust allowance
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
3.8.1.1 Make-up air from enclosures used by vehicles with internal combustion engines
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 Discharges treated to reduce objectionable Type B effluent
3.10.5 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
4.4.4.1 Contaminant generation rate
4.4.4.2 Full ventilation 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
4.5.3.1 General
4.5.3.2 Direct ducting from tailpipes
4.5.3.3 Direct ducting — Simple procedure
4.5.3.4 Direct ducting — Detailed procedure
4.5.3.5 Dynamometer engine testing
4.5.4 Vehicular lifts and shafts
4.5.4.1 Exhaust ventilation of vehicular lift cars
4.5.4.2 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
4.12.5.1 Location and number
4.12.5.2 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
5.2.1 Enclosure types
5.2.2 HEPA filters
5.2.3 Door opening and closing
5.3 Operating theatres
5.3.1 General
5.3.2 Air change rate
5.3.3 Air distribution
5.3.4 Recirculation
5.3.5 Outdoor air rate
5.3.6 Supply air filtration
5.3.7 Recycle and exhaust device location
5.3.8 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
5.4.5 Air distribution
5.5 Anaesthetic/induction rooms and bays
5.5.1 General
5.5.2 Outdoor air rate
5.5.3 Recirculation
5.5.4 Recycle and exhaust device location
5.5.5 Room air pressure
5.5.6 Air filtration
5.6 Infectious 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 Exhaust air rate
5.6.6 Room air pressure
5.6.7 Air distribution
5.6.7.1 Distribution
5.6.7.2 Exhaust openings
5.7 Protective isolation rooms
5.7.1 General
5.7.2 Supply air rate
5.7.3 Recirculation
5.7.4 Outdoor air rate
5.7.5 Room air pressure
5.7.6 Air distribution
5.8 Post anaesthetic care unit (PACU) (Recovery Stage 1)
5.8.1 General
5.8.2 Recirculation
5.8.3 Exhaust air rate
5.8.4 Air Distribution
5.9 Birthing suites or rooms
5.9.1 General
5.9.2 Recirculation
5.9.3 Exhaust air rate
5.9.4 Room air pressure
5.9.5 Air distribution
5.10 Autopsy rooms
5.10.1 General
5.10.2 Recirculation
5.10.3 Outdoor air rate
5.10.4 Exhaust air rate
5.10.5 Air distribution
5.10.6 Room air pressure
5.11 Dirty utility rooms
5.11.1 General
5.11.2 Recirculation
5.11.3 Exhaust air rate
5.11.4 Room air pressure
5.11.5 Make up air
5.12 Emergency department areas
5.12.1 General
5.12.2 Outdoor air rate
5.12.3 Recirculation
5.12.4 Exhaust
5.12.5 Room air pressure
5.12.6 Air distribution
Appendix A
Appendix B
B.1 Application
B.2 General exhaust for enclosures
Appendix C
Appendix D
D.1 General
D.2 Notation
D.3 Minimum introduced outdoor airflow rate
D.4 Residual effective outdoor airflow
D.4.1 General
D.4.2 Effective outdoor airflow from recycle air
D.4.3 Effective outdoor airflow from transfer air
D.4.4 Effective outdoor airflow from local air cleaning
D.4.5 Effective outdoor airflow from supply air cleaning
D.4.6 Effective outdoor airflow from central air cleaning
D.5 Efficiencies of air-cleaning units
D.5.1 General
D.5.2 Test methods for odours
D.5.3 Test methods for particulate contaminants
D.6 Calculation procedure
D.7 Example (Central air cleaning — Particulate filtration only)
D.8 Example (Central air cleaning — Particulate filtration and odour treatment)
Appendix E
E.1 Scope
E.2 Application
E.3 Figure symbols
E.4 Hood construction
E.4.1 General
E.4.2 Manufacture
E.4.3 Openings
E.4.4 Internal surface
E.4.4.1 Sloping
E.4.4.2 Profile
E.4.4.3 Hood gutters
E.4.4.4 Internal light fittings
E.5 Hood installation
E.6 Kitchen exhaust hoods incorporating grease-removal devices
E.7 Distance from grease-removal device to heat source
E.7.1 General
E.8 Kitchen exhaust hood airflow — calculations — examples
E.8.1 General
E.8.2 Low sidewall hoods (hood Type 1) calculation example
E.8.3 Corner-mounted hoods (hood Type 2) calculation example
E.8.4 Sidewall hoods (hood Type 3) calculation example
E.8.5 Island hoods (hood Type 4) calculation example
E.9 Hood type nomenclature
Appendix F
F.1 Scope
F.2 Design objectives
F.3 Proposal submission and approval
F.4 Air contaminants
F.5 Control of contaminants
F.5.1 Type 1 contaminants
F.5.2 Type 2 contaminants
F.6 Evaluation of air quality
F.6.1 General
F.6.2 Type 1 contaminants
F.6.3 Type 2 contaminants
F.6.3.1 General
F.6.3.2 Form 1 evaluation
F.6.3.3 Form 2 evaluation
F.6.3.3.1 General
F.6.3.3.2 Principles
F.6.4 Variation of test approach
F.7 Evaluation of devices and systems
F.8 Monitoring
Appendix G
G.1 Lag time
G.2 Lead time
Appendix H
H.1 General car park
H.2 Exposure standards
H.3 Short-term exposures
Appendix I
Appendix J
J.1 Fleet average co emission rates on cold engine start
J.2 Average car speed in car park
J.3 Ambient co concentration
J.4 Parking times
J.5 CO Criteria
J.6 Formulae
J.7 Derivation of formulae
J.8 Basis of Table 4.1
J.9 Basis of area minimum
J.10 Basis for staff exposure factor (Table 4.3)
Appendix K
K.1 Car parks with exit barriers
K.2 Car parks without exit barriers
Appendix L
L.1 Exit lanes
L.2 Entry lanes
L.3 Diesel vehicles
Appendix M
M.1 Marking
M.2 Commissioning
M.3 Reliability
M.4 Records
Appendix N
N.1 Performance application
N.2 Mechanical ventilation
N.3 Mixed ventilation
N.4 Other arrangements
N.5 Basis for exposure limits
Appendix O
Bibliography
Cited references in this standard
VDI 2052
Ventilation equipment for kitchens
UL 710
Exhaust Hoods for Commercial Cooking Equipment
EN 16282-1
Equipment for commercial kitchens — Components for ventilation in commercial kitchens — Part 1: General requirements including calculation method
EN 1822-1
High efficiency air filters (HEPA and ULPA) — Part 1: Classification, performance testing, marking
ASTM-F1704
Standard Test Method for Capture and Containment Performance of Commercial Kitchen Exhaust Ventilation Systems
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