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Standard 130-2025 -- Laboratory Methods of Testing Air Terminal Units
Full Description ANSI/ASHRAE Standard 130 specifies instrumentation, test installation methods, and procedures for measuring the capacity and related performance of constant-volume, variable-volume, and modulating integral diffuser air terminals. The 2025 revision of the standard includes updates and revisions to all parts of the standard. Key updates include the following: Relative humidity measurements, rather than wet-bulb temperature measurements, are used to determine air densities. The test in Section 5.6 has been redefined to more accurately determine the casing leakage of terminal units, based in part on airflow adjustments and regression calculations in CAN/CGSB 149.10-2019, “Determination of the Airtightness of Building Envelopes by the Fan Depressurization Method.” The casing leakage test has been expanded to determine leakage with and without the back draft damper sealed for parallel-flow fan-powered terminal units. Informative appendices have been added to explain equation derivations for air density and leakage parameter calculations. The sound test section now refers to AHRI 220 for determining sound power and adds corresponding definitions and language to describe the various test configurations required, including a new appendix with examples. The modulating diffuser sound test setup has been eliminated and now refers to ANSI/ASHRAE Standard 70. |
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