ISO 5135:2020 pdf download

ISO 5135:2020 pdf download,Acoustics — Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation test room
1 Scope
This document establishes general rules for the acoustic testing of air-terminal devices, air-terminal units, dampers and valves used in air diffusion and air distribution systems in order to determine sound power levels as defined in ISO 3741.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3741:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for reverberation test rooms
ISO 5167 (all parts), Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full
ISO 7235, Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units —Insertion loss, flow noise and total pressure loss
ANSI/ASHRAE 70, Method of Testing the Performance of Air Outlets and Air Inlets
ANSI/ASHRAE 130, Laboratory Methods of Testing Air Terminal Units
EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of damper and valves
EN 12238, Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating for mixed flow application
EN 12239, Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating for displacement flow applications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
Note 1 to entry: If a specific frequency weighting as specified in IEC 61672-1 and/or specific frequency bands are applied, this is indicated by appropriate subscripts; e.g. L WA denotes the A-weighted sound power level.
Note 2 to entry: This definition is technically in accordance with ISO 80000-8:2020, 8-15.
[SOURCE: ISO/TR 25417:2007, 2.9, modified – In the Note 2 to entry, the reference to ISO 80000-8 has been updated to its latest edition.]
3.3 frequency range of interest
range that includes the octave bands with nominal mid-band frequencies between 125 Hz and 8 000 Hz (optional between 63 Hz and 8 000 Hz) or the one-third-octave bands with mid-band frequencies between 100 Hz and 10 000 Hz (optional between 50 Hz and 10 000 Hz)
Note 1 to entry: The user is encouraged to qualify the room in the 63 Hz octave band and include this sound.Some equipment can generate significant sound in the 63 Hz octave band.