ISO 5135-2020 pdf free.Acoustics — Determination of soundpower levels of noise from air-terminal devices, air-terminal units,dampers and valves by measurementin a reverberation test room.
This document establishes general rules for the acoustic testing of air-terminal devices, air-terminalunits,dampers and valves used in air diffusion and air distribution systems in order to determinesound power levels as defined in ISO 3741.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated 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 sourcesusing sound pressure — Precision methods for reverberation test rooms.ISO 5167(all parts),Measurement of fluid flow by means of pressure differential devices inserted in circularcross-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 InletsANSI/ASHRAE 130,Laboratory Methods of ‘Testing Air Terminal Units.EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of damper and valvesEN 12238,Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating for mixedflow application.EN 12239,Ventilation for buildings — Air terminal devices – Aerodynamic testing and rating fordisplacement flow applications.
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 frequenciesbetween 100 Hz and 10 000 Hz (optional between 50 Hz and 10 000 Hz)
The acoustic test facilities，instrumentation and procedures that shall be used,including roomqualification tests, are described in ISO 3741.
This document is applicable to equipment operating under steady state conditions and with a volumenot greater than 5 % of the volume of the reverberation test room.lf the equipment is greater than 2 % up to 5 % of the room volume, then the test room shall be qualifiedaccording to ISO 3741 with all equipment present in the room. The test facilities shall be qualified forbroad-band sound per the corresponding annex in ISO 3741.ISO 5135 pdf download.