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