ISO 29462:2022
Field testing of general ventilation filtration devices and systems for in situ removal efficiency by particle size and resistance to airflow
This document describes a procedure for measuring the performance of general ventilation air cleaning devices in their end use installed configuration. The performance measurements include removal efficiency by particle size and the resistance to airflow. The test procedures include the definition and reporting of the system airflow.
The procedure describes a method of counting ambient air particles of 0,3 μm to 5,0 μm upstream and downstream of the in-place air cleaner(s) in a functioning air handling system. The procedure describes the reduction of particle counter data to calculate removal efficiency by particle size.
Since filter installations vary dramatically in design and shape, a protocol for evaluating the suitability of a site for filter evaluation and for system evaluation is included. When the evaluated site conditions meet the minimum criteria established for system evaluation, the performance evaluation of the system can also be performed according to this procedure.
This document also describes performance specifications for the testing equipment and defines procedures for calculating and reporting the results. This document is not intended for measuring performance of portable or movable room air cleaners or for evaluation of filter installations with an expected filtration efficiency at or above 99 % or at or below 30 % when measured at 0,4 μm.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Test equipment and setup
4.1 Particle counter
4.2 Diluter
4.3 Pump
4.4 Sampling system
4.4.1 General
4.4.2 Sampling probes
4.4.3 Sampling lines
4.4.4 Sampling locations
4.4.5 Valve (manual or automatic)
4.4.6 Isoaxial sampling nozzle
4.4.7 Flow meter
4.5 Air velocity measurement instrument
4.6 Relative humidity (RH) measurement instrument
4.7 Temperature measurement instrument
4.8 Resistance to airflow measurement instrument
4.9 Test equipment maintenance and calibration
5 Site evaluation
5.1 General
5.2 Filter installation pre-testing inspection
5.3 Approval for testing
6 Test procedure
6.1 Air velocity
6.2 Relative humidity (RH)
6.3 Temperature
6.4 Resistance to airflow
6.5 Removal efficiency
6.5.1 Removal efficiency tests
6.5.2 Sampling method
6.6 Sampling probes
6.6.1 Location of sampling probes
6.6.2 Location of upstream sampling probes
6.6.3 Location of downstream sampling probes — Filter efficiency test
6.6.4 Location of downstream sampling probes — System efficiency test
7 Expression of results
7.1 General information
7.2 Data collection
8 Errors and data analyses
8.1 General
8.2 Relative humidity (RH)
8.3 Air temperature
8.4 Aerosol composition
8.5 Uniformity of aerosol concentration
8.6 Coincidence errors — Particle counter
8.7 Particle losses
9 Calculation of results
9.1 Calculation of removal efficiency
9.1.1 General
9.1.2 Dataset sample average
9.1.3 Minimum upstream concentration
9.1.4 Particle size range efficiency
9.1.5 Average efficiency by particle size
9.2 Calculation of uncertainty
9.2.1 General
9.2.2 95 % confidence limit
9.3 Coefficient of variation (Cv)
10 Optional enhanced test system
10.1 Application of enhanced test system
10.2 Principle of the enhanced test system
10.3 Determination of the corrected particle size
10.4 Presentation of results
Annex A (informative) Filter installation pre-testing inspection form
Annex B (informative) Approval for testing form
Annex C (informative) Example of how to complete testing
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Test equipment and setup
4.1 Particle counter
4.2 Diluter
4.3 Pump
4.4 Sampling system
4.4.1 General
4.4.2 Sampling probes
4.4.3 Sampling lines
4.4.4 Sampling locations
4.4.5 Valve (manual or automatic)
4.4.6 Isoaxial sampling nozzle
4.4.7 Flow meter
4.5 Air velocity measurement instrument
4.6 Relative humidity (RH) measurement instrument
4.7 Temperature measurement instrument
4.8 Resistance to airflow measurement instrument
4.9 Test equipment maintenance and calibration
5 Site evaluation
5.1 General
5.2 Filter installation pre-testing inspection
5.3 Approval for testing
6 Test procedure
6.1 Air velocity
6.2 Relative humidity (RH)
6.3 Temperature
6.4 Resistance to airflow
6.5 Removal efficiency
6.5.1 Removal efficiency tests
6.5.2 Sampling method
6.6 Sampling probes
6.6.1 Location of sampling probes
6.6.2 Location of upstream sampling probes
6.6.3 Location of downstream sampling probes — Filter efficiency test
6.6.4 Location of downstream sampling probes — System efficiency test
7 Expression of results
7.1 General information
7.2 Data collection
8 Errors and data analyses
8.1 General
8.2 Relative humidity (RH)
8.3 Air temperature
8.4 Aerosol composition
8.5 Uniformity of aerosol concentration
8.6 Coincidence errors — Particle counter
8.7 Particle losses
9 Calculation of results
9.1 Calculation of removal efficiency
9.1.1 General
9.1.2 Dataset sample average
9.1.3 Minimum upstream concentration
9.1.4 Particle size range efficiency
9.1.5 Average efficiency by particle size
9.2 Calculation of uncertainty
9.2.1 General
9.2.2 95 % confidence limit
9.3 Coefficient of variation (Cv)
10 Optional enhanced test system
10.1 Application of enhanced test system
10.2 Principle of the enhanced test system
10.3 Determination of the corrected particle size
10.4 Presentation of results
Annex A (informative) Filter installation pre-testing inspection form
Annex B (informative) Approval for testing form
Annex C (informative) Example of how to complete testing
Bibliography