ISO 5135:2020

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ISO 5135:2020 is an International Standard that outlines the procedures for determining the sound power levels of noise from air-terminal devices, air-terminal units, dampers, and valves used in air diffusion and distribution systems. These procedures are followed in a reverberation test room. The standard is based on the use of ISO 3741, which specifies the acoustic test facilities, instrumentation, and procedures for precise sound power level measurement