First published in 1972, Standard 70 defines laboratory methods of testing air outlets and air inlets used to terminate ducted and unducted systems for distribution and return of building air.<\/p>\n
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| 1<\/td>\n | ANSI\/ASHRAE Standard 70-2006 (RA 2011) <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | FOREWORD 1. PURPOSE 2. SCOPE 2.1 This standard includes the specifications for test instruments, facilities, installations, and procedures and methods of calculation for determining aerodynamic performance and sound generation of air outlets and air inlets. 2.2 The test methods in this standard apply to both isothermal and non-isothermal conditions. 3. DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Figure 1a Airstream drop distance. Figure 1c Airstream rise distance. Figure 1b Airstream envelope (isovel) and throw distance. Figure 1d Airstream spread distance. Figure 1e Neck, core, and face areas of grille (for two types of duct connections). <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 4. INSTRUMENTATION AND FACILITIES 4.1 Temperature Measurement. Temperature-measuring instruments shall meet the requirements of ANSI\/ASHRAE Standard 41.11 and the requirements of Sections 4.1.1 and 4.1.2 below. 4.2 Pressure Measurement. Pressure-measuring instruments shall meet the requirements of ASHRAE Standard 41.32 and the requirements of Sections 4.2.1 through 4.2.4 below. 4.3 Airflow Rate Measurement. Airflow rate shall be measured in accordance with ASHRAE Standard 41.2.3 Accuracy shall be no less than \u00b15.0% of the reading or 1 cfm (0.5 L\/s), whichever is greater. 4.4 Air Velocity Measurement. Air velocity measurements shall be made with mechanical or electrical anemometers having an accuracy shown in Table 2 and in accordance with Sections 4.4.1 and 4.4.2. TABLE 1 Maximum Scale Interval <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 4.5 Sound Measurement. The equipment and facility for the determination of sound power levels shall be in accordance NAIS Standard 12.51,5 which specifies the instrumentation, acoustic test facilities, and uncertainty of the measurements. Locations w… 5. TEST PROCEDURES 5.1 Air Outlet Static and Total Pressure. The test for outlet static and total pressure shall be conducted in accordance with the following subsections. TABLE 2 Velocity Measurement Accuracy Figure 2 Ducted test installation. Figure 3 Pressurized plenum test installation. <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 5.2 Air Inlet Static and Total Pressure. The test for air inlet static and total pressure shall be conducted in accordance with the following subsections. 5.3 Area Factor (Ak) 5.4 Throw, Spread, and Drop <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Figure 4 Diffuser locations for testing purposes. <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.5 Sound Generation Figure 5 Mounting detail (test device against a surface). 6. REFERENCES Figure 6 Mounting detail (test device away from a surface). INFORMATIVE APPENDIX A\u2014 Bibliography <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INFORMATIVE APPENDIX B\u2014 Throw Data Analysis and Application INFORMATIVE APPENDIX C\u2014 Room Test Heaters <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 7a Sample throw-terminal velocity graph for a product series. <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | INFORMATIVE APPENDIX D\u2014 Sound Rating Determination <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ANSI\/ASHRAE Standard 70-2006 (RA 2011) Method of Testing the Performance of Air Outlets and Air Inlets<\/b><\/p>\n |