Standard
UPDATE AVAILABLE
AS/NZS 4740:2000
[Superseded]Natural ventilators - Classification and performance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.
Published: 30/03/2000
Pages: 41
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.4 Definitions
1.5 Classification
1.5.1 Type classification
1.5.2 Performance classification
1.5.3 Dual classification
1.5.4 Corrosion resistance
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
2.3.4.1 Static load tests
2.3.4.2 Free field tests
2.4 Instrumentation
2.4.1 Airflow rate
2.4.1.1 Measurement
2.4.1.2 Calibration
2.4.2 Pressure
2.4.2.1 Measurement
2.4.2.2 Calibration
2.4.3 Temperature measurement
2.4.4 Water flow meters
2.4.5 Timers
2.4.6 Rain gauge
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
4 Information and marking
4.1 Product information
4.2 Marking
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
A1 General
A2 Information to be supplied by the buyer
A3 Published data
A4 Specification example
Appendix B
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
B4.4.1 General
B4.4.2 Installation
B4.4.3 Procedure
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
C1 Scope
C2 Principle
C3 Apparatus
C4 Procedure
C5 Test results
C5.1 Determination of rain leakage wind velocity (vr)
C5.2 Ventilator performance classification
Appendix D
D1 Scope
D2 Principle
D3 Apparatus
D4 Test specimen
D5 Procedure
D6 Calculations
D6.1 Discharge coefficient
D6.2 Effective aerodynamic area
Appendix E
E1 Scope
E2 Principle
E3 Apparatus
E4 Mounting of test specimen
E5 Procedure
E6 Calculation
E7 Alternative procedure
Appendix F
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
G1 Scope
G2 Principle
G3 Apparatus
G4 Mounting of test specimen
G5 Test loads
G6 Procedure
G7 Pass criteria
Appendix H
H1 Scope
H2 Principle
H3 Apparatus
H4 Mounting of the test specimen
H5 Test loads
H6 Procedure
H7 Pass criteria
Appendix I
I1 Scope
I2 Statistical sampling
I3 Product certification
I4 Supplier's quality system
I5 Other means of assessment
Cited references in this standard