ISO 13347-3-2004 PDF

Full title and description

St ISO 13347-3:2004 — "Industrial fans — Determination of fan sound power levels under standardized laboratory conditions — Part 3: Enveloping surface methods". This part of ISO 13347 specifies laboratory test arrangements and enveloping-surface measurement techniques for determining airborne sound power levels emitted by industrial fans (open inlet and/or open outlet configurations) and provides procedures for estimating ducted sound power with appropriate corrections.

Abstract

ISO 13347-3:2004 applies to industrial fans (as defined in ISO 5801 and ISO 13349) and is limited to measurement of airborne sound emission under standardized laboratory conditions using enveloping-surface methods. Vibration measurements and field (in-situ) testing are outside its intended use; the standard sets out required test arrangements, measurement surfaces, and calculation procedures including environmental corrections.

General information

• Status: Published (International Standard — stage: to be revised / under review as per ISO lifecycle).
• Publication date: 17 August 2004 (Edition 1, 2004).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.120 (Ventilators. Fans. Air-conditioners) / 17.140.20 (Noise emitted by machines and equipment).
• Edition / version: Edition 1 (2004) — with Technical Corrigendum 1 (2006) and Amendment 1 (2010) issued against the 2004 edition.
• Number of pages: 22 (main document; national/adopted versions and consolidated editions may vary in pagination when amendments are integrated).

Scope

This part of ISO 13347 establishes laboratory conditions and measurement procedures using enveloping-surface methods for determining the airborne sound power levels of industrial fans in standardized installations. It covers open inlet and/or open outlet sound power measurement, provides guidance for selecting the measurement surface and test set-up, and includes procedures for environmental correction and for estimating ducted sound power with end-reflection corrections where appropriate. It is not intended for field measurements where installation conditions differ from the specified laboratory arrangements.

Key topics and requirements

• Definition of applicable fan types and reference installations (relation to ISO 5801 and ISO 13349).
• Requirements for the acoustic test environment and ducting considerations.
• Procedures for determination and layout of the enveloping measurement surface around the fan.
• Measurement method and instrumentation for determining sound power levels (frequency-band reporting and averaging).
• Calculation of sound power level including environmental correction K and optional end-reflection corrections for ducted estimates.
• Normative annexes giving methods for environmental correction and informative bibliography for related acoustic standards.

Typical use and users

Primary users are acoustic test laboratories, fan and HVAC manufacturers, R&D and design engineers, certification bodies performing noise declarations or conformity assessments, and standards committees. It is used to generate repeatable, comparable sound power data for product development, specification, declaration, and regulatory compliance where laboratory-based fan noise data are required.

Related standards

ISO 13347-3 is part of the ISO 13347 series and references other standards such as ISO 5801 (fan performance testing) and ISO 13349. For certain ducted tests, ISO 5136 (sound power determination in ducts) is also relevant. National adoptions and related parts (ISO 13347-1, -2, -4) and associated British/adopted publications exist (for example BS ISO 13347-3:2004 and consolidated editions including amendment A1:2010).

Keywords

Industrial fans; fan sound power; acoustics; enveloping surface methods; laboratory measurement; noise emission; environmental correction; ISO 13347; fan testing; acoustic test method.

FAQ

Q: What is this standard?

A: ISO 13347-3:2004 is an international standard that defines laboratory test methods (enveloping-surface methods) for measuring the airborne sound power levels emitted by industrial fans.

Q: What does it cover?

A: It covers test arrangements, determination of measurement surfaces, measurement procedures and calculation methods (including environmental correction) for open inlet/open outlet fan sound power measurement in standardized laboratory conditions; it is not intended for in-situ field testing.

Q: Who typically uses it?

A: Acoustic laboratories, fan manufacturers, design and test engineers, certification bodies, and standards committees use it to obtain repeatable, comparable sound power data for development, compliance, and declaration purposes.

Q: Is it current or superseded?

A: The 2004 edition (Edition 1) is published and has an associated Technical Corrigendum (2006) and an Amendment (2010). According to ISO lifecycle notes the standard has been/was scheduled for review and may be subject to revision; users should check the latest status or consolidated national/adopted editions for integrated amendments.

Q: Is it part of a series?

A: Yes — ISO 13347 has multiple parts addressing acoustic measurement methods for fans (e.g., Parts 1, 2, 3 and 4) and ISO 13347-3 is the specific part that covers enveloping-surface methods. National/adopted versions and combined editions with amendments also exist.

Q: What are the key keywords?

A: Industrial fans; sound power; noise emission; enveloping surface; laboratory acoustic testing; environmental correction; fan acoustics; ISO 13347.