AS/NZS 4740:2000
Natural ventilators - Classification and performance
Specifies minimum requirements for ventilators designed to provide ventilation of enclosures by means of the natural flow of air. This Standard includes classification, performance and marking requirements. It also includes appendices outlining the performance test methods. This Standard does not apply to electrically powered ventilators or to smoke and heat exhaust ventilators.
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AS/NZS 4740:2000 NATURAL VENTILATORS - CLASSIFICATION AND PERFORMANCE
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.4.1 Discharge coefficient (coefficient of discharge)
1.4.2 Effective aerodymanic area
1.4.3 Final upper limit load
1.4.4 Flow coefficient (coefficient of flow)
1.4.5 Functional integrity
1.4.6 Natural ventilator (herein referred to as ventilator)
1.4.7 Permanent deflection
1.4.8 Pitch
1.4.9 Scale model
1.4.10 Stack height
1.4.11 Stack pressure
1.4.12 Static load test
1.4.13 Streaming
1.4.14 Structural integrity
1.4.15 Throat area
1.4.16 Vent pressure drop
1.4.17 Wind siphoning pressure
1.5 CLASSIFICATION
1.5.1 Type classification
1.5.2 Performance classification
1.5.3 Dual classification
1.5.4 Corrosion resistance
SECTION 2 PERFORMANCE TESTING
2.1 TYPE APPROVAL
2.2 TYPE TESTING
2.2.1 General
2.2.2 Range type
2.2.3 Specimen size
2.2.4 Scale models
2.3 PERFORMANCE REQUIREMENTS
2.3.1 Rain resistance
2.3.2 Effective aerodynamic area
2.3.3 Flow coefficient
2.3.4 Wind loading
2.4 INSTRUMENTATION
2.4.1 Airflow rate
2.4.2 Pressure
2.4.3 Temperature measurement
2.4.4 Water flow meters
2.4.5 Timers
2.4.6 Rain gauge
SECTION 3 CALCULATIONS
3.1 SCOPE
3.2 STACK PRESSURE AIRFLOW
3.2.1 Stack pressure
3.2.2 Airflow
3.3 WIND SIPHONING AIRFLOW
3.3.1 Wind siphoning pressure
3.3.2 Airflow
3.4 COMBINED EFFECT
3.5 NOMINAL PERFORMANCE
SECTION 4 INFORMATION AND MARKING
4.1 PRODUCT INFORMATION
4.2 MARKING
SECTION 5 TEST REPORTS
5.1 GENERAL
5.2 PRELIMINARY INFORMATION
5.3 TEST INFORMATION
5.3.1 Rain leakage test
5.3.2 Effective aerodynamic area test
5.3.3 Flow coefficient test
5.3.4 Wind load resistance tests
5.4 DEVIATIONS FROM STANDARD TEST PROCEDURE
APPENDIX A - PURCHASING GUIDELINES
A1 GENERAL
A2 INFORMATION TO BE SUPPLIED BY THE BUYER
A3 PUBLISHED DATA
A4 SPECIFICATION EXAMPLE
APPENDIX B - DETERMINATION OF RESISTANCE TO LEAKAGE DURING RAIN - TYPE 1 VENTILATOR
B1 SCOPE
B2 PRINCIPLE
B3 APPARATUS
B4 MEASUREMENTS
B4.1 Water collection
B4.2 Airflow rate measurement
B4.3 Pressure loss
B4.4 Water eliminator performance test
B5 TEST SPECIMEN AND CALIBRATION PLATE
B5.1 Test specimen
B5.2 Calibration plate
B6 PROCEDURE
B7 TEST RESULTS
B8 VENTILATOR RAIN PENETRATION CLASSIFICATION
APPENDIX C - DETERMINATION OF RESISTANCE TO LEAKAGE DURING RAIN - TYPE 2, 3 OR 4 VENTILATORS
C1 SCOPE
C2 PRINCIPLE
C3 APPARATUS
C4 PROCEDURE
C5 TEST RESULTS
C5.1 Determination of rain leakage wind velocity
C5.2 Ventilator performance classification
APPENDIX D - DETERMINATION OF DISCHARGE COEFFICIENT AND EFFECTIVE AERODYNAMIC AREA
D1 SCOPE
D2 PRINCIPLE
D3 APPARATUS
D4 TEST SPECIMEN
D5 PROCEDURE
D6 CALCULATIONS
D6.1 Discharge coefficient
D6.2 Effective aerodynamic area
APPENDIX E - DETERMINATION OF FLOW COEFFICIENT - TYPE 2, 3 OR 4 VENTILATORS
E1 SCOPE
E2 PRINCIPLE
E3 APPARATUS
E4 MOUNTING OF TEST SPECIMEN
E5 PROCEDURE
E6 CALCULATION
E7 ALTERNATIVE PROCEDURE
APPENDIX F - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 1 VENTILATORS
F1 SCOPE
F2 PRINCIPLE
F3 APPARATUS
F4 MOUNTING OF TEST SPECIMEN
F4.1 Air pressure test
F4.2 Static load test
F5 TEST LOADS
F6 PROCEDURE
F7 PASS CRITERIA
APPENDIX G - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 2 OR 3 VENTILATORS
G1 SCOPE
G2 PRINCIPLE
G3 APPARATUS
G4 MOUNTING OF TEST SPECIMEN
G5 TEST LOADS
G6 PROCEDURE
G7 PASS CRITERIA
APPENDIX H - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 2, 3, OR 4 VENTILATORS
H1 SCOPE
H2 PRINCIPLE
H3 APPARATUS
H4 MOUNTING OF THE TEST SPECIMEN
H5 TEST LOADS
H6 PROCEDURE
H7 PASS CRITERIA
APPENDIX I - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
I1 SCOPE
I2 STATISTICAL SAMPLING
I3 PRODUCT CERTIFICATION
I4 SUPPLIER'S QUALITY SYSTEM
I5 OTHER MEANS OF ASSESSMENT
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References
Prefinished/prepainted sheet metal products for interior/exterior building applications - Performance requirements
Related Information
Building Code Compliance Document G4
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS1
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AS/NZS 4740:2000 NATURAL VENTILATORS - CLASSIFICATION AND PERFORMANCE
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.4.1 Discharge coefficient (coefficient of discharge)
1.4.2 Effective aerodymanic area
1.4.3 Final upper limit load
1.4.4 Flow coefficient (coefficient of flow)
1.4.5 Functional integrity
1.4.6 Natural ventilator (herein referred to as ventilator)
1.4.7 Permanent deflection
1.4.8 Pitch
1.4.9 Scale model
1.4.10 Stack height
1.4.11 Stack pressure
1.4.12 Static load test
1.4.13 Streaming
1.4.14 Structural integrity
1.4.15 Throat area
1.4.16 Vent pressure drop
1.4.17 Wind siphoning pressure
1.5 CLASSIFICATION
1.5.1 Type classification
1.5.2 Performance classification
1.5.3 Dual classification
1.5.4 Corrosion resistance
SECTION 2 PERFORMANCE TESTING
2.1 TYPE APPROVAL
2.2 TYPE TESTING
2.2.1 General
2.2.2 Range type
2.2.3 Specimen size
2.2.4 Scale models
2.3 PERFORMANCE REQUIREMENTS
2.3.1 Rain resistance
2.3.2 Effective aerodynamic area
2.3.3 Flow coefficient
2.3.4 Wind loading
2.4 INSTRUMENTATION
2.4.1 Airflow rate
2.4.2 Pressure
2.4.3 Temperature measurement
2.4.4 Water flow meters
2.4.5 Timers
2.4.6 Rain gauge
SECTION 3 CALCULATIONS
3.1 SCOPE
3.2 STACK PRESSURE AIRFLOW
3.2.1 Stack pressure
3.2.2 Airflow
3.3 WIND SIPHONING AIRFLOW
3.3.1 Wind siphoning pressure
3.3.2 Airflow
3.4 COMBINED EFFECT
3.5 NOMINAL PERFORMANCE
SECTION 4 INFORMATION AND MARKING
4.1 PRODUCT INFORMATION
4.2 MARKING
SECTION 5 TEST REPORTS
5.1 GENERAL
5.2 PRELIMINARY INFORMATION
5.3 TEST INFORMATION
5.3.1 Rain leakage test
5.3.2 Effective aerodynamic area test
5.3.3 Flow coefficient test
5.3.4 Wind load resistance tests
5.4 DEVIATIONS FROM STANDARD TEST PROCEDURE
APPENDIX A - PURCHASING GUIDELINES
A1 GENERAL
A2 INFORMATION TO BE SUPPLIED BY THE BUYER
A3 PUBLISHED DATA
A4 SPECIFICATION EXAMPLE
APPENDIX B - DETERMINATION OF RESISTANCE TO LEAKAGE DURING RAIN - TYPE 1 VENTILATOR
B1 SCOPE
B2 PRINCIPLE
B3 APPARATUS
B4 MEASUREMENTS
B4.1 Water collection
B4.2 Airflow rate measurement
B4.3 Pressure loss
B4.4 Water eliminator performance test
B5 TEST SPECIMEN AND CALIBRATION PLATE
B5.1 Test specimen
B5.2 Calibration plate
B6 PROCEDURE
B7 TEST RESULTS
B8 VENTILATOR RAIN PENETRATION CLASSIFICATION
APPENDIX C - DETERMINATION OF RESISTANCE TO LEAKAGE DURING RAIN - TYPE 2, 3 OR 4 VENTILATORS
C1 SCOPE
C2 PRINCIPLE
C3 APPARATUS
C4 PROCEDURE
C5 TEST RESULTS
C5.1 Determination of rain leakage wind velocity
C5.2 Ventilator performance classification
APPENDIX D - DETERMINATION OF DISCHARGE COEFFICIENT AND EFFECTIVE AERODYNAMIC AREA
D1 SCOPE
D2 PRINCIPLE
D3 APPARATUS
D4 TEST SPECIMEN
D5 PROCEDURE
D6 CALCULATIONS
D6.1 Discharge coefficient
D6.2 Effective aerodynamic area
APPENDIX E - DETERMINATION OF FLOW COEFFICIENT - TYPE 2, 3 OR 4 VENTILATORS
E1 SCOPE
E2 PRINCIPLE
E3 APPARATUS
E4 MOUNTING OF TEST SPECIMEN
E5 PROCEDURE
E6 CALCULATION
E7 ALTERNATIVE PROCEDURE
APPENDIX F - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 1 VENTILATORS
F1 SCOPE
F2 PRINCIPLE
F3 APPARATUS
F4 MOUNTING OF TEST SPECIMEN
F4.1 Air pressure test
F4.2 Static load test
F5 TEST LOADS
F6 PROCEDURE
F7 PASS CRITERIA
APPENDIX G - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 2 OR 3 VENTILATORS
G1 SCOPE
G2 PRINCIPLE
G3 APPARATUS
G4 MOUNTING OF TEST SPECIMEN
G5 TEST LOADS
G6 PROCEDURE
G7 PASS CRITERIA
APPENDIX H - DETERMINATION OF WIND LOADING RESISTANCE - TYPE 2, 3, OR 4 VENTILATORS
H1 SCOPE
H2 PRINCIPLE
H3 APPARATUS
H4 MOUNTING OF THE TEST SPECIMEN
H5 TEST LOADS
H6 PROCEDURE
H7 PASS CRITERIA
APPENDIX I - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
I1 SCOPE
I2 STATISTICAL SAMPLING
I3 PRODUCT CERTIFICATION
I4 SUPPLIER'S QUALITY SYSTEM
I5 OTHER MEANS OF ASSESSMENT
AS/NZS 4740:2000
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.