ANSI/ASHRAE Standard 52.2-2007, Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size, establishes a test procedure for evaluating the performance of air-cleaning devices as a function of particle size.

Standard 52.2-2007, the most recent edition of this standard, incorporates Addendum a into the standard’s previous edition, Standard 52.2-1999. Addendum a changed the procedure for evaluating the results of the reference filter test in order to make the reference filter test more practical and to allow a wider selection of filters to fulfill the test requirements.

Standard 52.2 was developed so that both users and specifiers can compare products, predict a uniform level of known performance under operating conditions with reasonable certainty, and determine appropriate air-cleaner efficiencies for specific situations.

Historically, standards for testing air cleaners have been developed in response to the needs of the times. Protection of machinery and coils came first, then reduction of soiling. Now concerns about indoor air quality and respirable particles, protection of products during manufacturing, and protection of HVAC equipment have prompted development of this test standard based on particle size.

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4	FOREWORD FOREWORD Description of Standard Description of Standard Electronic Air Cleaners Electronic Air Cleaners Passive Electrostatic Fibrous Media Air Filters Passive Electrostatic Fibrous Media Air Filters Not an Application Standard Not an Application Standard
5	Acknowledgments Acknowledgments 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 This standard describes a method of laboratory testing to measure the performance of general ventilation air-cleaning devices. 2.1 This standard describes a method of laboratory testing to measure the performance of general ventilation air-cleaning devices. 2.2 The method of testing measures the performance of air- cleaning devices in removing particles of specific diameters as the d… 2.2 The method of testing measures the performance of air- cleaning devices in removing particles of specific diameters as the d… 2.3 This standard also establishes performance specifications for the equipment required to conduct the tests, defines methods o… 2.3 This standard also establishes performance specifications for the equipment required to conduct the tests, defines methods o… 3. DEFINITIONS AND ACRONYMS 3. DEFINITIONS AND ACRONYMS 3.1 Definitions. Some terms are defined below for the purposes of this standard. When definitions are not provided, common usage shall apply (see Reference 3, Informative Appendix G). 3.1 Definitions. Some terms are defined below for the purposes of this standard. When definitions are not provided, common usage shall apply (see Reference 3, Informative Appendix G).
6	3.2 Acronyms 3.2 Acronyms 4. TEST APPARATUS 4. TEST APPARATUS 4.1 Mandatory and Discretionary Requirements. Critical dimensions and arrangements of the test apparatus are shown in the figure… 4.1 Mandatory and Discretionary Requirements. Critical dimensions and arrangements of the test apparatus are shown in the figure… 4.2 Test Duct 4.2 Test Duct
9	4.3 Aerosol Generator. Other than the requirements of the following subsections, design features of the aerosol generator are discretionary. Refer to Informative Appendix B of this standard for guidance. 4.3 Aerosol Generator. Other than the requirements of the following subsections, design features of the aerosol generator are discretionary. Refer to Informative Appendix B of this standard for guidance. 4.4 Aerosol Sampling System. Other than the requirements of the following subsections, the design features of the sampling system are discretionary. Refer to Informative Appendix B of this standard for guidance. 4.4 Aerosol Sampling System. Other than the requirements of the following subsections, the design features of the sampling system are discretionary. Refer to Informative Appendix B of this standard for guidance.
10	4.5 Device Flow Measurement. Flow measurement shall be made by means of ASME long-radius flow nozzles (see Figure 9-1) with stat… 4.5 Device Flow Measurement. Flow measurement shall be made by means of ASME long-radius flow nozzles (see Figure 9-1) with stat… 4.6 Particle Counter(s) 4.6 Particle Counter(s) 4.7 Test Apparatus for Dust Loading 4.7 Test Apparatus for Dust Loading
11	5. APPARATUS QUALIFICATION TESTING 5. APPARATUS QUALIFICATION TESTING 5.1 Apparatus qualification tests shall verify quantitatively that the test rig and sampling procedures are capable of providing reliable particle size efficiency measurements. The tests shall be performed in accordance with Table 5-1. 5.1 Apparatus qualification tests shall verify quantitatively that the test rig and sampling procedures are capable of providing reliable particle size efficiency measurements. The tests shall be performed in accordance with Table 5-1.
13	5.2 Velocity Uniformity in the Test Duct 5.2 Velocity Uniformity in the Test Duct 5.3 Aerosol Concentration Uniformity in the Test Duct 5.3 Aerosol Concentration Uniformity in the Test Duct
14	5.4 Downstream Mixing of Aerosol 5.4 Downstream Mixing of Aerosol 5.5 Aerosol Generator Response Time 5.5 Aerosol Generator Response Time
15	5.6 Concentration Limit of the Particle Counter 5.6 Concentration Limit of the Particle Counter 5.7 100% Efficiency Test and Development of Purge Time 5.7 100% Efficiency Test and Development of Purge Time 5.8 Correlation Test 5.8 Correlation Test 5.9 Test Duct Air Leakage Test 5.9 Test Duct Air Leakage Test 5.10 Particle Counter(s) Zero. The zero count of the particle counter(s) shall be verified to be <10 total counts per sample tim… 5.10 Particle Counter(s) Zero. The zero count of the particle counter(s) shall be verified to be <10 total counts per sample tim… 5.11 Particle Counter(s) Sizing Accuracy. The sizing accuracy of the particle counter(s) shall be checked by sampling an aerosol… 5.11 Particle Counter(s) Sizing Accuracy. The sizing accuracy of the particle counter(s) shall be checked by sampling an aerosol… 5.12 Confirmation of the Activity of the Aerosol Neutralizer 5.12 Confirmation of the Activity of the Aerosol Neutralizer
16	5.13 Dust Feeder Airflow Rate. Determine and record the gauge pressure on the compressed air line to the venturi necessary to pr… 5.13 Dust Feeder Airflow Rate. Determine and record the gauge pressure on the compressed air line to the venturi necessary to pr… 5.14 Final Filter Efficiency. Weigh the final filter to the nearest 0.1 g and install it in the test duct without the test devic… 5.14 Final Filter Efficiency. Weigh the final filter to the nearest 0.1 g and install it in the test duct without the test devic… 5.15 Summary of Qualification Test Requirements. Qualification test criteria shall conform to Table 5-1. 5.15 Summary of Qualification Test Requirements. Qualification test criteria shall conform to Table 5-1. 5.16 Apparatus Maintenance. Maintenance items and schedules shall conform to Table 5-2. 5.16 Apparatus Maintenance. Maintenance items and schedules shall conform to Table 5-2.
17	6. TEST MATERIALS 6. TEST MATERIALS 6.1 Test Aerosol. The test aerosol shall be solid-phase potassium chloride (KCl) particles generated from an aqueous solution. The solution shall be prepared by dissolving reagent grade KCl in distilled water. 6.1 Test Aerosol. The test aerosol shall be solid-phase potassium chloride (KCl) particles generated from an aqueous solution. The solution shall be prepared by dissolving reagent grade KCl in distilled water. 6.2 Loading Dust 6.2 Loading Dust 6.3 Final Filter 6.3 Final Filter
19	7. SELECTION AND PREPARATION OF THE TEST DEVICE 7. SELECTION AND PREPARATION OF THE TEST DEVICE 7.1 Selection Procedures 7.1 Selection Procedures 7.2 Preparation of the Test Sample 7.2 Preparation of the Test Sample 8. TEST PROCEDURES 8. TEST PROCEDURES 8.1 Airflow Rates for Tests. Tests shall be run and reports generated for an airflow rate as specified in either Section 8.1.1 or Section 8.1.2. 8.1 Airflow Rates for Tests. Tests shall be run and reports generated for an airflow rate as specified in either Section 8.1.1 or Section 8.1.2. 8.2 Test Sequence. The sequence of tests on the device shall be as follows: 8.2 Test Sequence. The sequence of tests on the device shall be as follows: 9. MEASUREMENT OF RESISTANCE VerSus AIRFLOW 9. MEASUREMENT OF RESISTANCE VerSus AIRFLOW 9.1 Install the device in the test duct. 9.1 Install the device in the test duct. 9.2 Establish and record airflow rates measured by the flow nozzle. Refer to Figure 9-1. For the purposes of this standard, airflow rate shall be defined by the following equations: 9.2 Establish and record airflow rates measured by the flow nozzle. Refer to Figure 9-1. For the purposes of this standard, airflow rate shall be defined by the following equations: 9.3 The pressure drop across the nozzle shall be at least 100 Pa (0.4 in. of water) at the test airflow rate, and the nozzle position and static taps shall conform to Figure 4-1. 9.3 The pressure drop across the nozzle shall be at least 100 Pa (0.4 in. of water) at the test airflow rate, and the nozzle position and static taps shall conform to Figure 4-1.
20	9.4 Measure and record the resistance of the device at a minimum of four airflow rates: 50%, 75%, 100%, and 125% of test airflow rate. Resistance shall be measured between the static taps. 9.4 Measure and record the resistance of the device at a minimum of four airflow rates: 50%, 75%, 100%, and 125% of test airflow rate. Resistance shall be measured between the static taps. 10. DETERMINATION OF PARTICLE SIZE EFFICIENCY 10. DETERMINATION OF PARTICLE SIZE EFFICIENCY 10.1 Symbols and Subscripts 10.1 Symbols and Subscripts 10.2 Test Sampling 10.2 Test Sampling
21	10.3 Correlation Ratio 10.3 Correlation Ratio 10.4 Penetration 10.4 Penetration 10.5 Efficiency 10.5 Efficiency 10.6 Data Reduction 10.6 Data Reduction
24	10.7 Test Program for Dust-Loading and Particle Size Efficiency 10.7 Test Program for Dust-Loading and Particle Size Efficiency 10.8 Reporting Results of Loading Tests 10.8 Reporting Results of Loading Tests
25	11. REPORTING RESULTS 11. REPORTING RESULTS 11.1 Test results shall be reported using the test report format shown in this standard. Figures 11-1a through 11-1d comprise th… 11.1 Test results shall be reported using the test report format shown in this standard. Figures 11-1a through 11-1d comprise th… 11.2 The summary section of the performance report shall include the following information: 11.2 The summary section of the performance report shall include the following information: 11.3 Inclusion of test data in the summary report is optional. If furnished, it shall consist of all data recorded during the six test runs and shall be formatted similarly to Figure 11-1d. 11.3 Inclusion of test data in the summary report is optional. If furnished, it shall consist of all data recorded during the six test runs and shall be formatted similarly to Figure 11-1d. 12. MINIMUM EFFICIENCY REPORTING VALUE (MERV) FOR AIR CLEANERS 12. MINIMUM EFFICIENCY REPORTING VALUE (MERV) FOR AIR CLEANERS 12.1 The minimum efficiency reporting value (MERV) for an air cleaner shall be based on three composite average PSE points devel… 12.1 The minimum efficiency reporting value (MERV) for an air cleaner shall be based on three composite average PSE points devel… 12.2 The minimum final resistance for an air cleaner shall be in accordance with Table 12-1, except that the final resistance shall always be the same as or greater than twice the initial resistance. 12.2 The minimum final resistance for an air cleaner shall be in accordance with Table 12-1, except that the final resistance shall always be the same as or greater than twice the initial resistance. 12.3 The minimum efficiency reporting value in the specified size ranges and final resistance for reporting purposes shall be in… 12.3 The minimum efficiency reporting value in the specified size ranges and final resistance for reporting purposes shall be in… 12.4 The reporting designator shall be a combination of the air cleaner’s MERV and the test airflow rate (e.g., MERV10 at 0.93 indicates that the air cleaner has a MERV10 when tested at 0.93 m3/s [1970 cfm]). 12.4 The reporting designator shall be a combination of the air cleaner’s MERV and the test airflow rate (e.g., MERV10 at 0.93 indicates that the air cleaner has a MERV10 when tested at 0.93 m3/s [1970 cfm]). 13. NORMATIVE REFERENCES 13. NORMATIVE REFERENCES
28	informative APPENDIX A COMMENTARY informative APPENDIX A COMMENTARY
31	informative APPENDIX B TEST PROCEDURE SUGGESTIONS AND EXAMPLES informative APPENDIX B TEST PROCEDURE SUGGESTIONS AND EXAMPLES
34	informative APPENDIX C HOW TO READ A TEST REPORT informative APPENDIX C HOW TO READ A TEST REPORT
36	informative APPENDIX D MINIMUM EFFICIENCY REPORTING GUIDANCE informative APPENDIX D MINIMUM EFFICIENCY REPORTING GUIDANCE
40	informative APPENDIX E CROSS-REFERENCE AND APPLICATION GUIDELINES informative APPENDIX E CROSS-REFERENCE AND APPLICATION GUIDELINES
42	informative APPENDIX F ACRONYMS AND CONVERSION FORMULAE informative APPENDIX F ACRONYMS AND CONVERSION FORMULAE INformative APPENDIX G INFORMATIVE REFERENCES INformative APPENDIX G INFORMATIVE REFERENCES
43	Informative appendix H addenda description information Informative appendix H addenda description information

Published By	Publication Date	Number of Pages
ASHRAE	2007	47


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Standard Title	ASHRAE Standard 52.2-2007 Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size (ANSI Approved)
Published Code	ASHRAE
Publication Date	2007
Pages Count	47

ASHRAE 52.2 07 2007

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