ISO 13347-3:2004/Amd 1:2010

Overview

ISO 13347-3:2004/Amd 1:2010 is an amendment to the international standard outlining methods for determining the sound power levels of industrial fans under standardized laboratory conditions. This document specifically addresses enveloping surface methods used to measure acoustic performance, ensuring consistent and reliable results. Developed by ISO Technical Committee ISO/TC 117 (Fans), it provides enhanced guidance for accurate sound measurement in industrial environments.

The amendment focuses on clarifying measurement uncertainties, particularly for low-frequency sound assessments, helping manufacturers and testing laboratories achieve better accuracy when evaluating fan noise emissions.

Key Topics

• Industrial Fan Sound Power Measurement
  Defines standardized procedures to quantify the sound power emitted by industrial fans, ensuring data comparability across different products and tests.

• Enveloping Surface Method
  Describes the technique of measuring sound levels on a hypothetical surface surrounding the fan to capture its total acoustic emission effectively.

• Measurement Uncertainty
  Introduces updated considerations for uncertainty in sound measurement, especially at frequencies below 100 Hz, emphasizing the need for precise instruments and controlled environments. See ISO 13347-1 for detailed uncertainty evaluation.

• Standardization and Laboratory Conditions
  Emphasizes conducting measurements in standardized laboratory settings to minimize external noise interference and maximize reproducibility.

Applications

• Fan Design and Development
  Engineers and designers use this standard to evaluate noise emission early in product development, facilitating improvements in acoustic performance.

• Quality Control Testing
  Manufacturers apply the method to verify compliance with noise regulations and customer requirements during production.

• Regulatory Compliance
  Helps industries meet occupational health and environmental noise standards by providing reliable, repeatable sound power level data.

• Acoustic Performance Benchmarking
  Facilitates comparison of noise levels among different fan models or manufacturers using a standardized testing protocol.

• Research and Development
  Supports academic and industrial research focused on noise reduction and acoustic optimization of industrial ventilation systems.

Related Standards

• ISO 13347-1: Fundamentals of Measurement
  Provides foundational guidance on measurement uncertainty, critical for interpreting results in Part 3.

• ISO 13347-2: Sound Intensity Method
  Offers an alternative sound power measurement approach using sound intensity techniques.

• ISO 5136: Acoustic Performance of Ventilation Systems
  Covers measurement of sound emitted by air-moving devices in ducts and enclosures.

• ISO 3744 / ISO 3745: Engineering Methods for Noise Measurement
  General standards for determination of sound power levels by sound pressure.

By following the guidelines of ISO 13347-3:2004/Amd 1:2010, stakeholders in the industrial fan sector can achieve accurate and standardized acoustic measurements to support effective product development, regulatory compliance, and noise control initiatives. This amendment reinforces the importance of precise instrumentation and controlled testing environments, especially for low-frequency sound analysis critical in many industrial applications.